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dias
March 12, 2018
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Confinement and XSB in QCD – Mysteries and beauty of soliton dynamics in nonAbelian gauge theories by Kenichi Konishi (Università di Pisa)
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The true nature of quark confinement and chiral symmetry breaking in the real world of strong interactions, believed to be described by SU(3) Quantum Chromodynamics (QCD), still evades us. Deep insights into the possible infrared dynamics of strongly-coupled nonAbelian gauge theories such as QCD come from the analyses of N=1 or N=2 supersymmetric gauge theories. I will review and discuss some of the beautiful ideas which were born in earlier studies of topological aspects of field theories, but since have been tested, clarified and enriched, especially in the context of supersymmetric world. Central in the whole discussion will be the topological soliton monopoles and vortices, their quantum dynamics, various dualities, anomalies, and the crucial role played by the flavor symmetries. Of particular interest will be confinement vacua near the strongly-coupled infrared fixed points. I will briefly mention also some very recent results on the chiral symmetry breaking and confinement on chiral varieties of QCD.
dias
February 26, 2018
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CMB Lensing: Fundamental Physics from Maps of the Invisible by Blake Sherwin (Cambridge)
**
Dark matter not only forms an invisible cosmic scaffolding within which galaxies form, its distribution in the universe also contains a wealth of information about neutrinos, dark energy, and physics at the earliest times. Measurements of gravitational lensing in the cosmic microwave background (CMB) allow this matter distribution to be directly seen and mapped. In my talk, I will first discuss recent measurements of CMB lensing and their scientific implications. I will then explain why upcoming measurements of the CMB lensing signal, with experiments such as AdvancedACT and Simons Observatory, will be remarkably powerful probes of cosmology. Lensing is not only a signal, however, but also a source of noise that limits how much we can learn about the very early universe. With illustrations from recent work, I will explain why delensing - removing the lensing effect to reveal the primordial sky - is crucial for the future of CMB cosmology.
dias
October 23, 2017
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Can the graviton have a mass ? by Cédric Deffayet (IAP & IHES)
**
In General Relativity (GR), the leading description we have today of gravity, the graviton (or a vanilla gravitational wave) is strictly massless. This is reflected on the infinite range of the gravitational interaction. However, almost since the first formulation of GR, came also the wish to change the large distance behaviour of gravity by making the graviton somehow massive. On this road, various obstructions were discovered (in particular in the 70's) some long thought to be insuperable. However, the idea to make the graviton massive came back in the beginning of this century with the first attempts to replace dark energy by a modification of gravity at cosmological distances. The first attempt of this kind, formulated in the framework of the so-called DGP model, lead to recent developments which culminated in several discoveries in the years 2010 showing that the above mentioned obstructions can in fact be overcome but also to other result reaching further than massive gravity strictly speaking. We will review these issues both at the historical and conceptual level, underlying also some of the leftover issues.
dias
June 26, 2017
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Dark Matter: from an historical perspective to recent results and prospects by Yann Mambrini (Laboratoire de Physique Theorique (LPT), CNRS, Orsay)
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I will review in this presentation the historical evolution of the concept of"Dark Matter", from the first observations of "anomalies" in the 30's until the development of the hypothesis of the existence of a dark halo. The presentation will be entirely based on the original historical papers, reconstructing (by their ideas but also their mistakes) the appearance of a dark side of the Universe. The talk will include discussions of original articles by Poincaré, Zwicky, Oort, Jansky, Gamow, Peebles, Zeldovich, Bond and many others, opening on the prospect for the near future.
dias
December 5, 2016
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Neutrinos, Lepton Number Violation and the Baryon Asymmetry of the Universe by Heinrich Paes (Dortmund)
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Neutrino masses are often understood as a consequence of the breaking of lepton number, leading to a rich phenomenology of beyond the Standard Model processes, including neutrinoless double beta decay, collider processes and effects on the Baryon Asymmetry of the Universe. Such global symmetries are usually expected to be broken by quantum gravity effects, and arise in many GUT models. Even if lepton number is conserved, however, the existence of neutrino masses requires the Standard Model to be extended. The question whether lepton number is conserved or vioated is thus at the core of the link between neutrino masses and physics beyond the Standard Model. Moreover, neutrinoless double beta decay, lepton number violating collider processes and the Baryon Asymmetry of the Universe (BAU) are intimately related. In particular lepton number violating processes at low energies in combination with sphaleron transitions will typically erase any pre-existing baryon asymmetry of the Universe. In this talk we discuss the importance of lepton number violation and these tight connections between neutrinoless double beta decay, lepton number violating processes at the LHC and constraints from successful baryogenesis.
dias
November 22, 2016
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Lattice Approach to Black Holes by Masanori Hanada (Kyoto University)
**
The gauge/gravity duality conjecture claims that certain gauge theories, which are typically supersymmetric, give nonperturbative formulations of superstring/M-theory, at least about certain background geometries. If the duality conjecture is correct, it enables us to learn about superstring/M-theory, especially its quantum gravitational aspects, by solving gauge theories. However, because it is difficult to solve gauge theories without relying on symmetries, the power of the duality has not been fully explored. In this talk, we demonstrate that numerical methods from lattice gauge theory provide us with powerful tools. After briefly explaining the theoretical developments in lattice and lattice-motivated methods for supersymmetric gauge theories in these 15 years, we demonstrate the power of numerical methods by using the D0-brane quantum mechanics as a specific example. We show how (the D0-brane version of) the so-called 3/4-problem has been solved, and give quantitative evidence for the duality at finite temperature, including stringy effects. We will also apply the numerical method to the 'bulk reconstruction'; we study the dynamics of the eigenvalue of the matrix fields and suggest a simple way of identifying the black hole horizon.
dias
June 22, 2016
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Visit from Palantir by Palantir Technologies
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As part of the Inspire-Educate-Innovate program, Palantir Technologies – the third highest valued tech startup in Silicon Valley - will visit SDU. They will discuss how they apply their skills and products to stop terrorist attacks, discover new medicines, gain an edge in global financial markets and would be delighted to meet you! Demand for Palantir's work across Europe and Scandinavia is picking up quickly, and we are experiencing a particular spike in interest for the work we do in Denmark. As a result, we will be visiting SDU on the 22nd of June to meet with some of Denmark's most talented. Palantirians are people with exceptional analytic ability, creative minds, technical aptitude, and a gift for finding the details that matter. We are driven by the mission of leaving the world better than we found it, no matter how challenging the problem.
dias
June 2, 2016 at 15:30
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Baryon and Nuclear Masses from Lattice QCD by Martin Savage (Washington)
**
Mass 2016 Talks Thursday June 2 Strong-coupling approaches to lattice QCD are useful since they allow for analytical investigations and can lead to alternative simulation algorithms if a sign problem is present. To go beyond the strong-coupling limit, the gauge action needs to be included. In the past, several ideas to induce the gauge action by means of auxiliary fields were proposed. Here, we follow a proposal of Budczies and Zirnbauer (BZ), which has the unique advantage of using only a small number of auxiliary bosons. We show, by a combination of analytical and numerical results, that the BZ discretization has a continuum limit in the Yang-Mills universality class. Using this discretization, we can change the order of integration in the QCD path integral to arrive at formulations in which the gauge fields have been integrated out. We briefly discuss such dual representations of lattice QCD. [/flvcp3] Abelian and non-Abelian (2+1)-d Chern-Simons theories describe gauge fields, whose mass is of topological origin. Such theories are interesting because they give rise to anyons, whose braiding may allow universal topological quantum computation. We consider lattice Chern-Simons theories with a doubled set of degrees of freedom, associated with both the original and the dual lattice. In the Hamiltonian formulation, the Chern-Simons term then manifests itself in non-trivial commutation relations between the operators associated with a cross formed by an original link and the corresponding dual link. In the large "photon" mass limit, a doubled Abelian U(1) lattice Chern-Simons theory reduces to Kitaev's toric code, a topologically robust storage device for quantum information. We also construct doubled non-Abelian Chern-Simons theories with discrete gauge groups S3, D8, and Δ_{27}, which resemble features of O(2), SU(2), and SU(3) gauge theories, respectively. The relation of these models to Kitaev's non-Abelian quantum double models as well as their confining dynamics are also investigated. [/flvcp3] I will outline recent work revising the standard picture of gravitational waves from phase transitions in the early universe, and prospects for detection of a first order electroweak transition in the coming era of gravitational wave astronomy. [/flvcp3] On September 14, 2015, gravitational waves from the merger of two black holes rippled through the Laser Interferometer Gravitational-wave Observatory (LIGO). The measurement of these ripples would ultimately lead to the first direct detection of gravitational waves, the first observation of a binary black hole, and the identification of a new class of stellar-mass black holes. In this talk, I trace the history of gravitational waves from Einstein to the LIGO detection. I describe the properties of the first gravitational-wave source (dubbed GW150914) and discuss the implications for gravitational-wave astronomy. I conclude with a discussion of some of the promising new research directions that have emerged in the wake of GW150914. [/flvcp3] The status of Lattice QCD calculations of the baryons and lightest nuclei is reviewed. Preliminary decompositions of these masses that may be of interest are presented. [/flvcp3]
dias
June 2, 2016 at 14:00
**
The first detection of gravitational waves and beyond by Eric Thrane (LIGO, Monash)
**
Mass 2016 Talks Thursday June 2 Strong-coupling approaches to lattice QCD are useful since they allow for analytical investigations and can lead to alternative simulation algorithms if a sign problem is present. To go beyond the strong-coupling limit, the gauge action needs to be included. In the past, several ideas to induce the gauge action by means of auxiliary fields were proposed. Here, we follow a proposal of Budczies and Zirnbauer (BZ), which has the unique advantage of using only a small number of auxiliary bosons. We show, by a combination of analytical and numerical results, that the BZ discretization has a continuum limit in the Yang-Mills universality class. Using this discretization, we can change the order of integration in the QCD path integral to arrive at formulations in which the gauge fields have been integrated out. We briefly discuss such dual representations of lattice QCD. [/flvcp3] Abelian and non-Abelian (2+1)-d Chern-Simons theories describe gauge fields, whose mass is of topological origin. Such theories are interesting because they give rise to anyons, whose braiding may allow universal topological quantum computation. We consider lattice Chern-Simons theories with a doubled set of degrees of freedom, associated with both the original and the dual lattice. In the Hamiltonian formulation, the Chern-Simons term then manifests itself in non-trivial commutation relations between the operators associated with a cross formed by an original link and the corresponding dual link. In the large "photon" mass limit, a doubled Abelian U(1) lattice Chern-Simons theory reduces to Kitaev's toric code, a topologically robust storage device for quantum information. We also construct doubled non-Abelian Chern-Simons theories with discrete gauge groups S3, D8, and Δ_{27}, which resemble features of O(2), SU(2), and SU(3) gauge theories, respectively. The relation of these models to Kitaev's non-Abelian quantum double models as well as their confining dynamics are also investigated. [/flvcp3] I will outline recent work revising the standard picture of gravitational waves from phase transitions in the early universe, and prospects for detection of a first order electroweak transition in the coming era of gravitational wave astronomy. [/flvcp3] On September 14, 2015, gravitational waves from the merger of two black holes rippled through the Laser Interferometer Gravitational-wave Observatory (LIGO). The measurement of these ripples would ultimately lead to the first direct detection of gravitational waves, the first observation of a binary black hole, and the identification of a new class of stellar-mass black holes. In this talk, I trace the history of gravitational waves from Einstein to the LIGO detection. I describe the properties of the first gravitational-wave source (dubbed GW150914) and discuss the implications for gravitational-wave astronomy. I conclude with a discussion of some of the promising new research directions that have emerged in the wake of GW150914. [/flvcp3] The status of Lattice QCD calculations of the baryons and lightest nuclei is reviewed. Preliminary decompositions of these masses that may be of interest are presented. [/flvcp3]
dias
June 2, 2016 at 11:30
**
Gravitational waves from a first order electroweak phase transition by Mark Hindmarsh (Sussex)
**
Mass 2016 Talks Thursday June 2 Strong-coupling approaches to lattice QCD are useful since they allow for analytical investigations and can lead to alternative simulation algorithms if a sign problem is present. To go beyond the strong-coupling limit, the gauge action needs to be included. In the past, several ideas to induce the gauge action by means of auxiliary fields were proposed. Here, we follow a proposal of Budczies and Zirnbauer (BZ), which has the unique advantage of using only a small number of auxiliary bosons. We show, by a combination of analytical and numerical results, that the BZ discretization has a continuum limit in the Yang-Mills universality class. Using this discretization, we can change the order of integration in the QCD path integral to arrive at formulations in which the gauge fields have been integrated out. We briefly discuss such dual representations of lattice QCD. [/flvcp3] Abelian and non-Abelian (2+1)-d Chern-Simons theories describe gauge fields, whose mass is of topological origin. Such theories are interesting because they give rise to anyons, whose braiding may allow universal topological quantum computation. We consider lattice Chern-Simons theories with a doubled set of degrees of freedom, associated with both the original and the dual lattice. In the Hamiltonian formulation, the Chern-Simons term then manifests itself in non-trivial commutation relations between the operators associated with a cross formed by an original link and the corresponding dual link. In the large "photon" mass limit, a doubled Abelian U(1) lattice Chern-Simons theory reduces to Kitaev's toric code, a topologically robust storage device for quantum information. We also construct doubled non-Abelian Chern-Simons theories with discrete gauge groups S3, D8, and Δ_{27}, which resemble features of O(2), SU(2), and SU(3) gauge theories, respectively. The relation of these models to Kitaev's non-Abelian quantum double models as well as their confining dynamics are also investigated. [/flvcp3] I will outline recent work revising the standard picture of gravitational waves from phase transitions in the early universe, and prospects for detection of a first order electroweak transition in the coming era of gravitational wave astronomy. [/flvcp3] On September 14, 2015, gravitational waves from the merger of two black holes rippled through the Laser Interferometer Gravitational-wave Observatory (LIGO). The measurement of these ripples would ultimately lead to the first direct detection of gravitational waves, the first observation of a binary black hole, and the identification of a new class of stellar-mass black holes. In this talk, I trace the history of gravitational waves from Einstein to the LIGO detection. I describe the properties of the first gravitational-wave source (dubbed GW150914) and discuss the implications for gravitational-wave astronomy. I conclude with a discussion of some of the promising new research directions that have emerged in the wake of GW150914. [/flvcp3] The status of Lattice QCD calculations of the baryons and lightest nuclei is reviewed. Preliminary decompositions of these masses that may be of interest are presented. [/flvcp3]
dias
June 2, 2016 at 10:30
**
Doubled Abelian and non-Abelian Chern-Simons Gauge Theories on the Lattice by Uwe-Jens Wiese (Bern)
**
Mass 2016 Talks Thursday June 2 Strong-coupling approaches to lattice QCD are useful since they allow for analytical investigations and can lead to alternative simulation algorithms if a sign problem is present. To go beyond the strong-coupling limit, the gauge action needs to be included. In the past, several ideas to induce the gauge action by means of auxiliary fields were proposed. Here, we follow a proposal of Budczies and Zirnbauer (BZ), which has the unique advantage of using only a small number of auxiliary bosons. We show, by a combination of analytical and numerical results, that the BZ discretization has a continuum limit in the Yang-Mills universality class. Using this discretization, we can change the order of integration in the QCD path integral to arrive at formulations in which the gauge fields have been integrated out. We briefly discuss such dual representations of lattice QCD. [/flvcp3] Abelian and non-Abelian (2+1)-d Chern-Simons theories describe gauge fields, whose mass is of topological origin. Such theories are interesting because they give rise to anyons, whose braiding may allow universal topological quantum computation. We consider lattice Chern-Simons theories with a doubled set of degrees of freedom, associated with both the original and the dual lattice. In the Hamiltonian formulation, the Chern-Simons term then manifests itself in non-trivial commutation relations between the operators associated with a cross formed by an original link and the corresponding dual link. In the large "photon" mass limit, a doubled Abelian U(1) lattice Chern-Simons theory reduces to Kitaev's toric code, a topologically robust storage device for quantum information. We also construct doubled non-Abelian Chern-Simons theories with discrete gauge groups S3, D8, and Δ_{27}, which resemble features of O(2), SU(2), and SU(3) gauge theories, respectively. The relation of these models to Kitaev's non-Abelian quantum double models as well as their confining dynamics are also investigated. [/flvcp3] I will outline recent work revising the standard picture of gravitational waves from phase transitions in the early universe, and prospects for detection of a first order electroweak transition in the coming era of gravitational wave astronomy. [/flvcp3] On September 14, 2015, gravitational waves from the merger of two black holes rippled through the Laser Interferometer Gravitational-wave Observatory (LIGO). The measurement of these ripples would ultimately lead to the first direct detection of gravitational waves, the first observation of a binary black hole, and the identification of a new class of stellar-mass black holes. In this talk, I trace the history of gravitational waves from Einstein to the LIGO detection. I describe the properties of the first gravitational-wave source (dubbed GW150914) and discuss the implications for gravitational-wave astronomy. I conclude with a discussion of some of the promising new research directions that have emerged in the wake of GW150914. [/flvcp3] The status of Lattice QCD calculations of the baryons and lightest nuclei is reviewed. Preliminary decompositions of these masses that may be of interest are presented. [/flvcp3]
dias
June 2, 2016 at 9:00
**
Induced QCD with two bosonic flavors by Tilo Wettig (Regensburg)
**
Mass 2016 Talks Thursday June 2 Strong-coupling approaches to lattice QCD are useful since they allow for analytical investigations and can lead to alternative simulation algorithms if a sign problem is present. To go beyond the strong-coupling limit, the gauge action needs to be included. In the past, several ideas to induce the gauge action by means of auxiliary fields were proposed. Here, we follow a proposal of Budczies and Zirnbauer (BZ), which has the unique advantage of using only a small number of auxiliary bosons. We show, by a combination of analytical and numerical results, that the BZ discretization has a continuum limit in the Yang-Mills universality class. Using this discretization, we can change the order of integration in the QCD path integral to arrive at formulations in which the gauge fields have been integrated out. We briefly discuss such dual representations of lattice QCD. [/flvcp3] Abelian and non-Abelian (2+1)-d Chern-Simons theories describe gauge fields, whose mass is of topological origin. Such theories are interesting because they give rise to anyons, whose braiding may allow universal topological quantum computation. We consider lattice Chern-Simons theories with a doubled set of degrees of freedom, associated with both the original and the dual lattice. In the Hamiltonian formulation, the Chern-Simons term then manifests itself in non-trivial commutation relations between the operators associated with a cross formed by an original link and the corresponding dual link. In the large "photon" mass limit, a doubled Abelian U(1) lattice Chern-Simons theory reduces to Kitaev's toric code, a topologically robust storage device for quantum information. We also construct doubled non-Abelian Chern-Simons theories with discrete gauge groups S3, D8, and Δ_{27}, which resemble features of O(2), SU(2), and SU(3) gauge theories, respectively. The relation of these models to Kitaev's non-Abelian quantum double models as well as their confining dynamics are also investigated. [/flvcp3] I will outline recent work revising the standard picture of gravitational waves from phase transitions in the early universe, and prospects for detection of a first order electroweak transition in the coming era of gravitational wave astronomy. [/flvcp3] On September 14, 2015, gravitational waves from the merger of two black holes rippled through the Laser Interferometer Gravitational-wave Observatory (LIGO). The measurement of these ripples would ultimately lead to the first direct detection of gravitational waves, the first observation of a binary black hole, and the identification of a new class of stellar-mass black holes. In this talk, I trace the history of gravitational waves from Einstein to the LIGO detection. I describe the properties of the first gravitational-wave source (dubbed GW150914) and discuss the implications for gravitational-wave astronomy. I conclude with a discussion of some of the promising new research directions that have emerged in the wake of GW150914. [/flvcp3] The status of Lattice QCD calculations of the baryons and lightest nuclei is reviewed. Preliminary decompositions of these masses that may be of interest are presented. [/flvcp3]
dias
June 1, 2016 at 17:10
**
Diphoton Excess From Minimal Composite Dynamics by Natascia Vignaroli (CP3-Origins)
**
Mass 2016 Talks Wednesday June 1 We compute all of the one-loop corrections that are enhanced, O(λ_i λ_j / 16 π^2), in the limit s >> |λ_i| v^2 >> M_W^2, s >> m_{12}^2 to all the 2 -> 2 longitudinal vector boson and Higgs boson scattering amplitudes in the CP-conserving two-Higgs doublet model with a softly broken Z_2 symmetry. In the two simplified scenarios we study, the typical bound we find is |λ_i(s)| < 4. Preliminary results from a comprehensive numerical fit will also be presented. Based on: 1401.0070, 1512.04567, and work in progress [/flvcp3] [/flvcp3] Leptonic low energy CP phases, of Dirac as well as Majorana type, can be predicted with the help of flavor and CP symmetries. However, the high energy CP phases in the lepton sector, relevant for leptogenesis, are in general unrelated to those at low energies and thus represent new sources of CP violation. We discuss a scenario in which all CP phases are constrained by flavor and CP symmetries. In this way, the CP violation at low and high energies becomes intimately related and, in particular, the sign of the baryon asymmetry of the Universe, generated via the mechanism of unflavored leptogenesis, is fixed. [/flvcp3] We discuss models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N) gauge theories and 9 based on SO(N). The two gauge groups lead to distinctive phenomenologies: SU(N) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders. [/flvcp3] We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches. [/flvcp3] [/flvcp3]
dias
June 1, 2016 at 16:50
**
Unveiling asymmetric Dark Matter through gamma-ray triangles by Emiliano Molinaro (CP3-Origins)
**
Mass 2016 Talks Wednesday June 1 We compute all of the one-loop corrections that are enhanced, O(λ_i λ_j / 16 π^2), in the limit s >> |λ_i| v^2 >> M_W^2, s >> m_{12}^2 to all the 2 -> 2 longitudinal vector boson and Higgs boson scattering amplitudes in the CP-conserving two-Higgs doublet model with a softly broken Z_2 symmetry. In the two simplified scenarios we study, the typical bound we find is |λ_i(s)| < 4. Preliminary results from a comprehensive numerical fit will also be presented. Based on: 1401.0070, 1512.04567, and work in progress [/flvcp3] [/flvcp3] Leptonic low energy CP phases, of Dirac as well as Majorana type, can be predicted with the help of flavor and CP symmetries. However, the high energy CP phases in the lepton sector, relevant for leptogenesis, are in general unrelated to those at low energies and thus represent new sources of CP violation. We discuss a scenario in which all CP phases are constrained by flavor and CP symmetries. In this way, the CP violation at low and high energies becomes intimately related and, in particular, the sign of the baryon asymmetry of the Universe, generated via the mechanism of unflavored leptogenesis, is fixed. [/flvcp3] We discuss models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N) gauge theories and 9 based on SO(N). The two gauge groups lead to distinctive phenomenologies: SU(N) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders. [/flvcp3] We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches. [/flvcp3] [/flvcp3]
dias
June 1, 2016 at 16:30
**
Composite Dark Matter by Oleg Antipin (Rudjer Boskovic Institute)
**
Mass 2016 Talks Wednesday June 1 We compute all of the one-loop corrections that are enhanced, O(λ_i λ_j / 16 π^2), in the limit s >> |λ_i| v^2 >> M_W^2, s >> m_{12}^2 to all the 2 -> 2 longitudinal vector boson and Higgs boson scattering amplitudes in the CP-conserving two-Higgs doublet model with a softly broken Z_2 symmetry. In the two simplified scenarios we study, the typical bound we find is |λ_i(s)| < 4. Preliminary results from a comprehensive numerical fit will also be presented. Based on: 1401.0070, 1512.04567, and work in progress [/flvcp3] [/flvcp3] Leptonic low energy CP phases, of Dirac as well as Majorana type, can be predicted with the help of flavor and CP symmetries. However, the high energy CP phases in the lepton sector, relevant for leptogenesis, are in general unrelated to those at low energies and thus represent new sources of CP violation. We discuss a scenario in which all CP phases are constrained by flavor and CP symmetries. In this way, the CP violation at low and high energies becomes intimately related and, in particular, the sign of the baryon asymmetry of the Universe, generated via the mechanism of unflavored leptogenesis, is fixed. [/flvcp3] We discuss models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N) gauge theories and 9 based on SO(N). The two gauge groups lead to distinctive phenomenologies: SU(N) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders. [/flvcp3] We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches. [/flvcp3] [/flvcp3]
dias
June 1, 2016 at 16:00
**
Symmetries for low and high energy CP phases in the lepton sector by Claudia Hagedorn (CP3-Origins)
**
Mass 2016 Talks Wednesday June 1 We compute all of the one-loop corrections that are enhanced, O(λ_i λ_j / 16 π^2), in the limit s >> |λ_i| v^2 >> M_W^2, s >> m_{12}^2 to all the 2 -> 2 longitudinal vector boson and Higgs boson scattering amplitudes in the CP-conserving two-Higgs doublet model with a softly broken Z_2 symmetry. In the two simplified scenarios we study, the typical bound we find is |λ_i(s)| < 4. Preliminary results from a comprehensive numerical fit will also be presented. Based on: 1401.0070, 1512.04567, and work in progress [/flvcp3] [/flvcp3] Leptonic low energy CP phases, of Dirac as well as Majorana type, can be predicted with the help of flavor and CP symmetries. However, the high energy CP phases in the lepton sector, relevant for leptogenesis, are in general unrelated to those at low energies and thus represent new sources of CP violation. We discuss a scenario in which all CP phases are constrained by flavor and CP symmetries. In this way, the CP violation at low and high energies becomes intimately related and, in particular, the sign of the baryon asymmetry of the Universe, generated via the mechanism of unflavored leptogenesis, is fixed. [/flvcp3] We discuss models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N) gauge theories and 9 based on SO(N). The two gauge groups lead to distinctive phenomenologies: SU(N) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders. [/flvcp3] We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches. [/flvcp3] [/flvcp3]
dias
June 1, 2016 at 15:30
**
Higher-order corrections in Higgs sectors of extensions of the Standard Model by Heidi Rzehak (CP3-Origins)
**
Mass 2016 Talks Wednesday June 1 We compute all of the one-loop corrections that are enhanced, O(λ_i λ_j / 16 π^2), in the limit s >> |λ_i| v^2 >> M_W^2, s >> m_{12}^2 to all the 2 -> 2 longitudinal vector boson and Higgs boson scattering amplitudes in the CP-conserving two-Higgs doublet model with a softly broken Z_2 symmetry. In the two simplified scenarios we study, the typical bound we find is |λ_i(s)| < 4. Preliminary results from a comprehensive numerical fit will also be presented. Based on: 1401.0070, 1512.04567, and work in progress [/flvcp3] [/flvcp3] Leptonic low energy CP phases, of Dirac as well as Majorana type, can be predicted with the help of flavor and CP symmetries. However, the high energy CP phases in the lepton sector, relevant for leptogenesis, are in general unrelated to those at low energies and thus represent new sources of CP violation. We discuss a scenario in which all CP phases are constrained by flavor and CP symmetries. In this way, the CP violation at low and high energies becomes intimately related and, in particular, the sign of the baryon asymmetry of the Universe, generated via the mechanism of unflavored leptogenesis, is fixed. [/flvcp3] We discuss models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N) gauge theories and 9 based on SO(N). The two gauge groups lead to distinctive phenomenologies: SU(N) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders. [/flvcp3] We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches. [/flvcp3] [/flvcp3]
dias
June 1, 2016 at 14:00
**
One-Loop Corrections to the Perturbative Unitarity Bound in the CP-Conserving Two-Higgs Doublet Model with a Softly Broken Z_2 Symmetry by Christopher Murphy (Scuola Normale Superiore)
**
Mass 2016 Talks Wednesday June 1 We compute all of the one-loop corrections that are enhanced, O(λ_i λ_j / 16 π^2), in the limit s >> |λ_i| v^2 >> M_W^2, s >> m_{12}^2 to all the 2 -> 2 longitudinal vector boson and Higgs boson scattering amplitudes in the CP-conserving two-Higgs doublet model with a softly broken Z_2 symmetry. In the two simplified scenarios we study, the typical bound we find is |λ_i(s)| < 4. Preliminary results from a comprehensive numerical fit will also be presented. Based on: 1401.0070, 1512.04567, and work in progress [/flvcp3] [/flvcp3] Leptonic low energy CP phases, of Dirac as well as Majorana type, can be predicted with the help of flavor and CP symmetries. However, the high energy CP phases in the lepton sector, relevant for leptogenesis, are in general unrelated to those at low energies and thus represent new sources of CP violation. We discuss a scenario in which all CP phases are constrained by flavor and CP symmetries. In this way, the CP violation at low and high energies becomes intimately related and, in particular, the sign of the baryon asymmetry of the Universe, generated via the mechanism of unflavored leptogenesis, is fixed. [/flvcp3] We discuss models where Dark Matter candidates arise as composite states of a new confining gauge force, stable thanks to accidental symmetries. Restricting to renormalizable theories compatible with SU(5) unification, we find 13 models based on SU(N) gauge theories and 9 based on SO(N). The two gauge groups lead to distinctive phenomenologies: SU(N) theories give complex DM, with potentially observable electric and magnetic dipole moments that lead to peculiar spin-independent cross sections; SO(N) theories give real DM, with challenging spin-dependent cross sections or inelastic scatterings. Models with Yukawa couplings also give rise to spin-independent direct detection mediated by the Higgs boson and to electric dipole moments for the electron. Each model predicts a specific set of lighter composite scalars, possibly observable at colliders. [/flvcp3] We introduce a new type of gamma-ray spectral feature, which we denominate gamma-ray triangle. This spectral feature arises in scenarios where dark matter self-annihilates via a chiral interaction into two Dirac fermions, which subsequently decay in flight into another fermion and a photon. The resulting photon spectrum resembles a sharp triangle and can be readily searched for in the gamma-ray sky. Using data from the Fermi-LAT and H.E.S.S. instruments, we find no evidence for such spectral feature and therefore set strong upper bounds on the corresponding annihilation cross section. A concrete realisation of a scenario yielding gamma-ray triangles consists of an asymmetric dark matter model where the dark matter particle carries lepton number. We show explicitly that this class of models can lead to intense gamma-ray spectral features, potentially at the reach of upcoming gamma-ray telescopes, opening a new window to explore asymmetric dark matter through indirect searches. [/flvcp3] [/flvcp3]
dias
May 31, 2016 at 16:30
**
SU(2) Gauge Theory with Two Flavours : lattice simulations for BSM by Vincent Drach (CERN)
**
Mass 2016 Talks Tuesday May 31 The QCD axion is a candidate for dark matter. I will explore the possibility that an axion associated with a hidden sector could provide both dark matter and dark energy. I will begin the lecture with an overview of different approaches to dark energy. [/flvcp3] I will review theories of Higgs as composite pseudo-Nambu-Goldstone Boson and explain why top partners are required for such theories to be natural. I will argue that LHC results to date, including the mild excess of di-photons with invariant mass near 750 GeV which has been recently reported by ATLAS and CMS, favor a composite Higgs. Measurements of di-Higgs production are critical for determining whether a heavy vector-like T-prime quark is indeed a top partner which cancels the ultraviolet sensitivity of the top contribution to the Higgs potential. [/flvcp3] I will describe recent progress in approaching the calculation of the hadronic light-by-light contribution to (g-2)μ with dispersive methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof. [/flvcp3] The word dilaton is currently used for two types of particles of seemingly different origin. One is the dilaton that appears in theories of gravity, including supergravity, string theory, and scalar-tensor theories such as Jordan-Brans-Dicke theory. The other dilaton is the Nambu-Goldstone boson appearing as a consequence of a spontaneous breaking of scale and conformal invariance. The two particles are generally speaking unrelated. Nevertheless, they share the feature of both satisfying soft theorems, according to which the scattering of a low-energy dilaton is entirely determined by symmetry properties. In this talk, I will first review the symmetry properties of the two dilatons. I will then demonstrate that both dilatons obey soft theorems through subsubleading order, which are similar, but in terms of symmetry have different origins. Finally I will discuss their differences as well as some recent applications of these newly discovered properties. [/flvcp3] The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z'-bosons and the Standard Model Z and {\gamma}. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z'-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z'-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z' spectrum. We conclude that in a variety of cases, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics. [/flvcp3] After a general introduction arguing that strongly interacting theories offer theoretically appealing solutions to some puzzled raised by the Standard Model of particle physics I will present a simple model based on an SU(2) gauge theory with two flavours. I will show that it can be used to provide a mechanism of dynamical electroweak symmetry breaking and/or an UV completion for a composite pseudo-Goldstone Higgs model. I will then argue that lattice calculation of the strong sector alone can provide useful constraints on the effective low energy description. I will then present the lattice results and discuss, in light of them, the expected signatures at the Large Hadron Collider. [/flvcp3]
dias
May 31, 2016 at 15:30
**
Multi-Z's at the LHC within Extra Dimension and Composite Higgs models by Elena Accommando (Southampton)
**
Mass 2016 Talks Tuesday May 31 The QCD axion is a candidate for dark matter. I will explore the possibility that an axion associated with a hidden sector could provide both dark matter and dark energy. I will begin the lecture with an overview of different approaches to dark energy. [/flvcp3] I will review theories of Higgs as composite pseudo-Nambu-Goldstone Boson and explain why top partners are required for such theories to be natural. I will argue that LHC results to date, including the mild excess of di-photons with invariant mass near 750 GeV which has been recently reported by ATLAS and CMS, favor a composite Higgs. Measurements of di-Higgs production are critical for determining whether a heavy vector-like T-prime quark is indeed a top partner which cancels the ultraviolet sensitivity of the top contribution to the Higgs potential. [/flvcp3] I will describe recent progress in approaching the calculation of the hadronic light-by-light contribution to (g-2)μ with dispersive methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof. [/flvcp3] The word dilaton is currently used for two types of particles of seemingly different origin. One is the dilaton that appears in theories of gravity, including supergravity, string theory, and scalar-tensor theories such as Jordan-Brans-Dicke theory. The other dilaton is the Nambu-Goldstone boson appearing as a consequence of a spontaneous breaking of scale and conformal invariance. The two particles are generally speaking unrelated. Nevertheless, they share the feature of both satisfying soft theorems, according to which the scattering of a low-energy dilaton is entirely determined by symmetry properties. In this talk, I will first review the symmetry properties of the two dilatons. I will then demonstrate that both dilatons obey soft theorems through subsubleading order, which are similar, but in terms of symmetry have different origins. Finally I will discuss their differences as well as some recent applications of these newly discovered properties. [/flvcp3] The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z'-bosons and the Standard Model Z and {\gamma}. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z'-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z'-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z' spectrum. We conclude that in a variety of cases, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics. [/flvcp3] After a general introduction arguing that strongly interacting theories offer theoretically appealing solutions to some puzzled raised by the Standard Model of particle physics I will present a simple model based on an SU(2) gauge theory with two flavours. I will show that it can be used to provide a mechanism of dynamical electroweak symmetry breaking and/or an UV completion for a composite pseudo-Goldstone Higgs model. I will then argue that lattice calculation of the strong sector alone can provide useful constraints on the effective low energy description. I will then present the lattice results and discuss, in light of them, the expected signatures at the Large Hadron Collider. [/flvcp3]
dias
May 31, 2016 at 14:00
**
Similarities and differences between the gravity dilaton and Nambu-Goldstone dilaton by Matin Mojaza (Nordita)
**
Mass 2016 Talks Tuesday May 31 The QCD axion is a candidate for dark matter. I will explore the possibility that an axion associated with a hidden sector could provide both dark matter and dark energy. I will begin the lecture with an overview of different approaches to dark energy. [/flvcp3] I will review theories of Higgs as composite pseudo-Nambu-Goldstone Boson and explain why top partners are required for such theories to be natural. I will argue that LHC results to date, including the mild excess of di-photons with invariant mass near 750 GeV which has been recently reported by ATLAS and CMS, favor a composite Higgs. Measurements of di-Higgs production are critical for determining whether a heavy vector-like T-prime quark is indeed a top partner which cancels the ultraviolet sensitivity of the top contribution to the Higgs potential. [/flvcp3] I will describe recent progress in approaching the calculation of the hadronic light-by-light contribution to (g-2)μ with dispersive methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof. [/flvcp3] The word dilaton is currently used for two types of particles of seemingly different origin. One is the dilaton that appears in theories of gravity, including supergravity, string theory, and scalar-tensor theories such as Jordan-Brans-Dicke theory. The other dilaton is the Nambu-Goldstone boson appearing as a consequence of a spontaneous breaking of scale and conformal invariance. The two particles are generally speaking unrelated. Nevertheless, they share the feature of both satisfying soft theorems, according to which the scattering of a low-energy dilaton is entirely determined by symmetry properties. In this talk, I will first review the symmetry properties of the two dilatons. I will then demonstrate that both dilatons obey soft theorems through subsubleading order, which are similar, but in terms of symmetry have different origins. Finally I will discuss their differences as well as some recent applications of these newly discovered properties. [/flvcp3] The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z'-bosons and the Standard Model Z and {\gamma}. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z'-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z'-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z' spectrum. We conclude that in a variety of cases, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics. [/flvcp3] After a general introduction arguing that strongly interacting theories offer theoretically appealing solutions to some puzzled raised by the Standard Model of particle physics I will present a simple model based on an SU(2) gauge theory with two flavours. I will show that it can be used to provide a mechanism of dynamical electroweak symmetry breaking and/or an UV completion for a composite pseudo-Goldstone Higgs model. I will then argue that lattice calculation of the strong sector alone can provide useful constraints on the effective low energy description. I will then present the lattice results and discuss, in light of them, the expected signatures at the Large Hadron Collider. [/flvcp3]
dias
May 31, 2016 at 11:30
**
Dispersive treatment of the hadronic light-by-light contribution to (g-2)μ by Giacomo Colangelo (Bern)
**
Mass 2016 Talks Tuesday May 31 The QCD axion is a candidate for dark matter. I will explore the possibility that an axion associated with a hidden sector could provide both dark matter and dark energy. I will begin the lecture with an overview of different approaches to dark energy. [/flvcp3] I will review theories of Higgs as composite pseudo-Nambu-Goldstone Boson and explain why top partners are required for such theories to be natural. I will argue that LHC results to date, including the mild excess of di-photons with invariant mass near 750 GeV which has been recently reported by ATLAS and CMS, favor a composite Higgs. Measurements of di-Higgs production are critical for determining whether a heavy vector-like T-prime quark is indeed a top partner which cancels the ultraviolet sensitivity of the top contribution to the Higgs potential. [/flvcp3] I will describe recent progress in approaching the calculation of the hadronic light-by-light contribution to (g-2)μ with dispersive methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof. [/flvcp3] The word dilaton is currently used for two types of particles of seemingly different origin. One is the dilaton that appears in theories of gravity, including supergravity, string theory, and scalar-tensor theories such as Jordan-Brans-Dicke theory. The other dilaton is the Nambu-Goldstone boson appearing as a consequence of a spontaneous breaking of scale and conformal invariance. The two particles are generally speaking unrelated. Nevertheless, they share the feature of both satisfying soft theorems, according to which the scattering of a low-energy dilaton is entirely determined by symmetry properties. In this talk, I will first review the symmetry properties of the two dilatons. I will then demonstrate that both dilatons obey soft theorems through subsubleading order, which are similar, but in terms of symmetry have different origins. Finally I will discuss their differences as well as some recent applications of these newly discovered properties. [/flvcp3] The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z'-bosons and the Standard Model Z and {\gamma}. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z'-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z'-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z' spectrum. We conclude that in a variety of cases, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics. [/flvcp3] After a general introduction arguing that strongly interacting theories offer theoretically appealing solutions to some puzzled raised by the Standard Model of particle physics I will present a simple model based on an SU(2) gauge theory with two flavours. I will show that it can be used to provide a mechanism of dynamical electroweak symmetry breaking and/or an UV completion for a composite pseudo-Goldstone Higgs model. I will then argue that lattice calculation of the strong sector alone can provide useful constraints on the effective low energy description. I will then present the lattice results and discuss, in light of them, the expected signatures at the Large Hadron Collider. [/flvcp3]
dias
May 31, 2016 at 10:30
**
Diagnostics of Top Partners for Natural Composite Higgs by Ann Nelson (Washington)
**
Mass 2016 Talks Tuesday May 31 The QCD axion is a candidate for dark matter. I will explore the possibility that an axion associated with a hidden sector could provide both dark matter and dark energy. I will begin the lecture with an overview of different approaches to dark energy. [/flvcp3] I will review theories of Higgs as composite pseudo-Nambu-Goldstone Boson and explain why top partners are required for such theories to be natural. I will argue that LHC results to date, including the mild excess of di-photons with invariant mass near 750 GeV which has been recently reported by ATLAS and CMS, favor a composite Higgs. Measurements of di-Higgs production are critical for determining whether a heavy vector-like T-prime quark is indeed a top partner which cancels the ultraviolet sensitivity of the top contribution to the Higgs potential. [/flvcp3] I will describe recent progress in approaching the calculation of the hadronic light-by-light contribution to (g-2)μ with dispersive methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof. [/flvcp3] The word dilaton is currently used for two types of particles of seemingly different origin. One is the dilaton that appears in theories of gravity, including supergravity, string theory, and scalar-tensor theories such as Jordan-Brans-Dicke theory. The other dilaton is the Nambu-Goldstone boson appearing as a consequence of a spontaneous breaking of scale and conformal invariance. The two particles are generally speaking unrelated. Nevertheless, they share the feature of both satisfying soft theorems, according to which the scattering of a low-energy dilaton is entirely determined by symmetry properties. In this talk, I will first review the symmetry properties of the two dilatons. I will then demonstrate that both dilatons obey soft theorems through subsubleading order, which are similar, but in terms of symmetry have different origins. Finally I will discuss their differences as well as some recent applications of these newly discovered properties. [/flvcp3] The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z'-bosons and the Standard Model Z and {\gamma}. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z'-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z'-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z' spectrum. We conclude that in a variety of cases, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics. [/flvcp3] After a general introduction arguing that strongly interacting theories offer theoretically appealing solutions to some puzzled raised by the Standard Model of particle physics I will present a simple model based on an SU(2) gauge theory with two flavours. I will show that it can be used to provide a mechanism of dynamical electroweak symmetry breaking and/or an UV completion for a composite pseudo-Goldstone Higgs model. I will then argue that lattice calculation of the strong sector alone can provide useful constraints on the effective low energy description. I will then present the lattice results and discuss, in light of them, the expected signatures at the Large Hadron Collider. [/flvcp3]
dias
May 31, 2016 at 9:00
**
Coupled dark energy and dark matter from axions by Robert Brandenberger (McGill)
**
Mass 2016 Talks Tuesday May 31 The QCD axion is a candidate for dark matter. I will explore the possibility that an axion associated with a hidden sector could provide both dark matter and dark energy. I will begin the lecture with an overview of different approaches to dark energy. [/flvcp3] I will review theories of Higgs as composite pseudo-Nambu-Goldstone Boson and explain why top partners are required for such theories to be natural. I will argue that LHC results to date, including the mild excess of di-photons with invariant mass near 750 GeV which has been recently reported by ATLAS and CMS, favor a composite Higgs. Measurements of di-Higgs production are critical for determining whether a heavy vector-like T-prime quark is indeed a top partner which cancels the ultraviolet sensitivity of the top contribution to the Higgs potential. [/flvcp3] I will describe recent progress in approaching the calculation of the hadronic light-by-light contribution to (g-2)μ with dispersive methods. I will first discuss general properties of the four-point function of the electromagnetic current in QCD, its Lorentz decomposition and dispersive representation. For what concerns the pseudoscalar pole contributions, I will give an overview of the determination of the pseudoscalar transition form factors. I will then consider the pion-loop contribution and discuss the recently proposed Mandelstam representation thereof. [/flvcp3] The word dilaton is currently used for two types of particles of seemingly different origin. One is the dilaton that appears in theories of gravity, including supergravity, string theory, and scalar-tensor theories such as Jordan-Brans-Dicke theory. The other dilaton is the Nambu-Goldstone boson appearing as a consequence of a spontaneous breaking of scale and conformal invariance. The two particles are generally speaking unrelated. Nevertheless, they share the feature of both satisfying soft theorems, according to which the scattering of a low-energy dilaton is entirely determined by symmetry properties. In this talk, I will first review the symmetry properties of the two dilatons. I will then demonstrate that both dilatons obey soft theorems through subsubleading order, which are similar, but in terms of symmetry have different origins. Finally I will discuss their differences as well as some recent applications of these newly discovered properties. [/flvcp3] The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z'-bosons and the Standard Model Z and {\gamma}. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z'-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z'-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z' spectrum. We conclude that in a variety of cases, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics. [/flvcp3] After a general introduction arguing that strongly interacting theories offer theoretically appealing solutions to some puzzled raised by the Standard Model of particle physics I will present a simple model based on an SU(2) gauge theory with two flavours. I will show that it can be used to provide a mechanism of dynamical electroweak symmetry breaking and/or an UV completion for a composite pseudo-Goldstone Higgs model. I will then argue that lattice calculation of the strong sector alone can provide useful constraints on the effective low energy description. I will then present the lattice results and discuss, in light of them, the expected signatures at the Large Hadron Collider. [/flvcp3]
dias
May 30, 2016 at 17:10
**
Neutrino masses and ordering via gravitational waves, photon and neutrino detections by Kasper Langæble (CP3-Origins)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 17:00
**
Renormalization Scheme Transformation and its Application by Gongjun Choi (Stony Brook)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 16:50
**
The Elementary Goldstone Higgs by Helene Gertov (CP3-Origins)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 16:40
**
Renormalization-group Evolution of Asymptotically Free Chiral Gauge Theories by Yanliang Shi (Stony Brook)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 16:30
**
ChPT with a Light Isosinglet Scalar by Martin Hansen (CP3-Origins)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 15:30
**
On the recent flavour anomalies by Marco Nardecchia (Cambridge)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 14:00
**
Combined analysis of effective Higgs portal dark matter model by Anthony Williams (Adelaide)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 11:30
**
Status and recent results from the CMS experiment by Yurii Maravin (CMS, Kansas State)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 10:30
**
Recent highligts from the LHCb experiment by Giacomo Graziani (LHCb, Firenze)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
May 30, 2016 at 9:00
**
Status and Recent Results from the ATLAS Experiment by Alessandro Cerri (ATLAS, Sussex)
**
Mass 2016 Talks Monday May 30 This presentation will cover recent searches from the ATLAS experiment, with emphasis on new resonances searches and new physics. Flavour, Higgs and the status and outlook of the recent hint of a diphoton resonance will be discussed. [/flvcp3] The LHCb experiment is stress-testing the Standard Model, and challenging any of its possible extension, through precision tests of the flavour sector. I will review some of the most significant results in rare and CP-violating decays of heavy hadrons. Thanks to the detector versatility and its unique coverage of the forward region, the LHCb physics program is also expanding well beyond its original roadmap, focused on testing the CKM paradigm. A selection of some of the most recent and original results, ranging from heavy hadron spectroscopy and EW physics to soft QCD and heavy ion physics, will be presented. [/flvcp3] [/flvcp3] We combine and extend the analyses of effective scalar, vector, Majorana and Dirac fermion Higgs portal models of Dark Matter (DM), in which DM couples to the Standard Model (SM) Higgs boson via an operator of the form ODM H†H. For the fermion models, we take an admixture of scalar ψψ and pseudoscalar ψiγ5ψ interaction terms. For each model, we apply constraints on the parameter space based on the Planck measured DM relic density and the LHC limits on the Higgs invisible branching ratio. For the first time, we perform a consistent study of the indirect detection prospects for these models based on the WMAP7/Planck observations of the CMB, a combined analysis of 15 dwarf spheroidal galaxies by Fermi-LAT and the upcoming Cherenkov Telescope Array (CTA). We also perform a correct treatment of the momentum-dependent direct search cross-section that arises from the pseudoscalar interaction term in the fermionic DM theories. We find, in line with previous studies, that current and future direct search experiments such as LUX and XENON1T can exclude much of the parameter space, and we demonstrate that a joint observation in both indirect and direct searches is possible for high mass WIMPs. In the case of a pure pseudoscalar interaction of a fermionic DM candidate, future gamma-ray searches are the only class of experiment capable of probing the high mass range of the theory. [/flvcp3] In this talk I will review the status of flavour physics after the first run of the LHC and in particular I will discuss recent results from the LHCb collaboration suggesting possible deviations from the SM predictions in semileptonic B-meson decays. I will also discuss possible interpretations of these anomalies in terms of New Physics. [/flvcp3] We consider the chiral Lagrangian coupled to an isosinglet scalar and show how this leads to new radiative corrections from scalar loops. In particular we calculate the one-loop corrections to the pion mass, the pion decay constant and the scalar mass. We furthermore argue that the new contributions from the scalar loops are flavor universal at next-to-leading order i.e. independent of the chiral symmetry breaking pattern. [/flvcp3] The properties of strongly coupled chiral gauge theories remain a challenge for theoretical understanding. In this talk I will classify and explore the UV to IR evolution of several simple sets of asymptotically free chiral gauge theories. In the ultraviolet limit, these theories are free. During renormalization-group evolution, several types of behavior can occur: non-Abelian Coulomb phase, confinement with formation of massless bound states or spontaneous symmetry breaking with formation of bilinear fermion condensates. I will discuss how to use some approximation methods to study different types of IR phases in these chiral gauge theories. [/flvcp3] The Higgs as a pseudo Goldstone Boson is not only possible in a composite scenario but also possible in an elementary scenario. In the elementary scenario the theory is both renormalizable and perturbative, which means that the quantum corrections can be calculated using the Coleman-Weinberg potential while permitting to explore the underlying parameter space. By characterising the available parameter space of the extended Higgs sector we discover that the preferred electroweak alignment angle is centred around θ = 0.02, corresponding to the Higgs chiral symmetry breaking scale f = 14 TeV. [/flvcp3] One of questions that one may address about the renormalization scheme is how well finite-order perturbative results calculated in different renormalization scheme agree with one another. In this talk, we introduce a notion of renormalization scheme transformation, which maps a gauge coupling of a gauge theory obtained in a specific scheme to another one in a different scheme. Then, we present some examples of application of the scheme transformation into the β function of especially the asymptotically free gauge theory with massless fermions. Furthermore, as for N=1 Supersymmetric gauge theory, we will make comparison between IR-zeros and poles from Padé approximants to β function in DR-bar scheme and those from NSVZ β function to provide a quantitative measure of agreement between the two different renormalization schemes. [/flvcp3] [/flvcp3]
dias
March 21, 2016
**
Underground physics: from neutrinos to dark matter search by Davide Franco (Université Paris Diderot)
**
Experiments looking for rare events, like weak interactions from cosmic or artificial neutrinos, proton decay, and detection of dark matter candidates, have challenging requirements on the backgrounds, achievable only in shielded underground laboratories. The low background technologies have already reached impressive results, allowing for looking for a few signal events per year in several tonnes of target material. However, future experiments in neutrino and dark matter physics need even higher sensitivities. Their success depends on the capability to increase the target mass and, at the same time, to further reduce the background. We will review, through the solar and sterile neutrino physics and the direct dark matter search, how the interplay between physics and technology drives the development of rare event experiments.
dias
February 29, 2016
**
The Fraternal Twin Higgs by Andrey Katz (CERN)
**
I will revisit the Twin Higgs Scenario as a solution to the little hierarchy problem, identify the structure of a minimal model and its viable parameter space, and analyze its collider implications. In this model naturalness generally leads to hidden valley phenomenology. The twin particles, including the top partner, are all Standard-Model neutral, but naturalness favors the existence of twin strong interactions – an asymptotically free force that confines not far above the Standard Model QCD scale – and a Higgs portal interaction. I will show that, taken together, these typically give rise to exotic decays of the Higgs to twin hadrons. Across a substantial portion of the parameter space, certain twin hadrons have visible and often displaced decays, providing a potentially striking LHC signature. I will also emphasize the cosmological safety of the Fraternal Twin Higgs scenario and show that it naturally realizes a Dark Matter candidate. The thermal abundance of the f fraternal twin dark matter is set by twin weak interactions, with a scale tightly tied to the weak scale of the Standard Model by naturalness considerations. The direct detection rate is instead set via fermionic Higgs portal interactions, which are likewise constrained by naturalness considerations but parametrically weaker than those leading to dark matter annihilation.
dias
May 19, 2015 at 16:20
**
Magnetized relativistic plasma as a Weyl metal by Volodya Miransky (Western University)
**
MASS 2015 Talks Tuesday May 19, 2015 I discuss several quantities that are central to our understanding of strong interaction dynamics and the exploration of the limits of the Standard Model, using numerical simulation of QCD on a space-time lattice. To this end I focus on the determination of structural properties of the nucleon, which has received special attention recently because of the proton radius puzzle. Secondly, I will discuss attempts to compute the hadronic vacuum polarisation contribution to the anomalous magnetic moment of the muon. [/flvcp3] [/flvcp3] Rare flavour-changing decays provide can probe well beyond the energy frontier and provide one of the most promising windows into TeV scale dynamics and beyond. I review key observables and recent theoretical and experimental results, and briefly comment on prospects for the near to medium term future. [/flvcp3] I will start by recalling the basic small- and large-field variants of inflation, emphasizing their UV sensitivity and the need for a UV completion, for example by string theory. Motivated by experimental searches for gravity waves or tensor modes, I will then focus on large-field models. In particular, I will discuss general no-go arguments against this version of inflation which are based on gravitational instantons and the so-called weak-gravity conjecture. Then I will turn to possible loopholes in those arguments and explain how certain string-theoretic constructions might, nevertheless, be able to realize large-field inflation. Some basic features of string compactifications and the string theory landscape will also be discussed. [/flvcp3] It has become recently established that a magnetized relativistic plasma yields an interesting example of a Weyl metal. I discuss the properties of magnetized relativistic plasma and its possible role in some astrophysics phenomena and heavy ion collisions. [/flvcp3]
dias
May 19, 2015 at 15:10
**
Large-Field Inflation and String Theory by Arthur Hebecker (Heidelberg)
**
MASS 2015 Talks Tuesday May 19, 2015 I discuss several quantities that are central to our understanding of strong interaction dynamics and the exploration of the limits of the Standard Model, using numerical simulation of QCD on a space-time lattice. To this end I focus on the determination of structural properties of the nucleon, which has received special attention recently because of the proton radius puzzle. Secondly, I will discuss attempts to compute the hadronic vacuum polarisation contribution to the anomalous magnetic moment of the muon. [/flvcp3] [/flvcp3] Rare flavour-changing decays provide can probe well beyond the energy frontier and provide one of the most promising windows into TeV scale dynamics and beyond. I review key observables and recent theoretical and experimental results, and briefly comment on prospects for the near to medium term future. [/flvcp3] I will start by recalling the basic small- and large-field variants of inflation, emphasizing their UV sensitivity and the need for a UV completion, for example by string theory. Motivated by experimental searches for gravity waves or tensor modes, I will then focus on large-field models. In particular, I will discuss general no-go arguments against this version of inflation which are based on gravitational instantons and the so-called weak-gravity conjecture. Then I will turn to possible loopholes in those arguments and explain how certain string-theoretic constructions might, nevertheless, be able to realize large-field inflation. Some basic features of string compactifications and the string theory landscape will also be discussed. [/flvcp3] It has become recently established that a magnetized relativistic plasma yields an interesting example of a Weyl metal. I discuss the properties of magnetized relativistic plasma and its possible role in some astrophysics phenomena and heavy ion collisions. [/flvcp3]
dias
May 19, 2015 at 13:30
**
Recent developments in flavour physics by Sebastian Jäger (University of Sussex)
**
MASS 2015 Talks Tuesday May 19, 2015 I discuss several quantities that are central to our understanding of strong interaction dynamics and the exploration of the limits of the Standard Model, using numerical simulation of QCD on a space-time lattice. To this end I focus on the determination of structural properties of the nucleon, which has received special attention recently because of the proton radius puzzle. Secondly, I will discuss attempts to compute the hadronic vacuum polarisation contribution to the anomalous magnetic moment of the muon. [/flvcp3] [/flvcp3] Rare flavour-changing decays provide can probe well beyond the energy frontier and provide one of the most promising windows into TeV scale dynamics and beyond. I review key observables and recent theoretical and experimental results, and briefly comment on prospects for the near to medium term future. [/flvcp3] I will start by recalling the basic small- and large-field variants of inflation, emphasizing their UV sensitivity and the need for a UV completion, for example by string theory. Motivated by experimental searches for gravity waves or tensor modes, I will then focus on large-field models. In particular, I will discuss general no-go arguments against this version of inflation which are based on gravitational instantons and the so-called weak-gravity conjecture. Then I will turn to possible loopholes in those arguments and explain how certain string-theoretic constructions might, nevertheless, be able to realize large-field inflation. Some basic features of string compactifications and the string theory landscape will also be discussed. [/flvcp3] It has become recently established that a magnetized relativistic plasma yields an interesting example of a Weyl metal. I discuss the properties of magnetized relativistic plasma and its possible role in some astrophysics phenomena and heavy ion collisions. [/flvcp3]
dias
May 19, 2015 at 10:40
**
Hadrons in Vacuum and in Medium in an Effective Chiral Approach by Dirk Rischke (Frankfurt)
**
MASS 2015 Talks Tuesday May 19, 2015 I discuss several quantities that are central to our understanding of strong interaction dynamics and the exploration of the limits of the Standard Model, using numerical simulation of QCD on a space-time lattice. To this end I focus on the determination of structural properties of the nucleon, which has received special attention recently because of the proton radius puzzle. Secondly, I will discuss attempts to compute the hadronic vacuum polarisation contribution to the anomalous magnetic moment of the muon. [/flvcp3] [/flvcp3] Rare flavour-changing decays provide can probe well beyond the energy frontier and provide one of the most promising windows into TeV scale dynamics and beyond. I review key observables and recent theoretical and experimental results, and briefly comment on prospects for the near to medium term future. [/flvcp3] I will start by recalling the basic small- and large-field variants of inflation, emphasizing their UV sensitivity and the need for a UV completion, for example by string theory. Motivated by experimental searches for gravity waves or tensor modes, I will then focus on large-field models. In particular, I will discuss general no-go arguments against this version of inflation which are based on gravitational instantons and the so-called weak-gravity conjecture. Then I will turn to possible loopholes in those arguments and explain how certain string-theoretic constructions might, nevertheless, be able to realize large-field inflation. Some basic features of string compactifications and the string theory landscape will also be discussed. [/flvcp3] It has become recently established that a magnetized relativistic plasma yields an interesting example of a Weyl metal. I discuss the properties of magnetized relativistic plasma and its possible role in some astrophysics phenomena and heavy ion collisions. [/flvcp3]
dias
May 19, 2015 at 9:00
**
Low-energy Precision Observables and the Role of Lattice QCD by Hartmut Wittig (Mainz)
**
MASS 2015 Talks Tuesday May 19, 2015 I discuss several quantities that are central to our understanding of strong interaction dynamics and the exploration of the limits of the Standard Model, using numerical simulation of QCD on a space-time lattice. To this end I focus on the determination of structural properties of the nucleon, which has received special attention recently because of the proton radius puzzle. Secondly, I will discuss attempts to compute the hadronic vacuum polarisation contribution to the anomalous magnetic moment of the muon. [/flvcp3] [/flvcp3] Rare flavour-changing decays provide can probe well beyond the energy frontier and provide one of the most promising windows into TeV scale dynamics and beyond. I review key observables and recent theoretical and experimental results, and briefly comment on prospects for the near to medium term future. [/flvcp3] I will start by recalling the basic small- and large-field variants of inflation, emphasizing their UV sensitivity and the need for a UV completion, for example by string theory. Motivated by experimental searches for gravity waves or tensor modes, I will then focus on large-field models. In particular, I will discuss general no-go arguments against this version of inflation which are based on gravitational instantons and the so-called weak-gravity conjecture. Then I will turn to possible loopholes in those arguments and explain how certain string-theoretic constructions might, nevertheless, be able to realize large-field inflation. Some basic features of string compactifications and the string theory landscape will also be discussed. [/flvcp3] It has become recently established that a magnetized relativistic plasma yields an interesting example of a Weyl metal. I discuss the properties of magnetized relativistic plasma and its possible role in some astrophysics phenomena and heavy ion collisions. [/flvcp3]
dias
May 4, 2015
**
Quarkonium with Effective field theories by Nora Brambrilla (Technische Universitaet Muenchen)
**
Quantum Chromodynamics (QCD) is the sector of the Standard Model of particle physics that describes the strong interaction, deceptively simple to formulate but notoriously difficult to solve. Heavy quarkonium is a multiscale system that probes the different energy regimes of QCD, from the high-energy region, where an expansion in the coupling constant is possible and precision studies may be done, to the low-energy region, dominated by confinement and the many manifestations of the nonperturbative strong dynamics. Properties of production and absorption of quarkonium in a medium are also crucial for the study of QCD at high density and temperature. On the theoretical side, the construction of new nonrelativistic effective field theories for quarkonium has recently revolutionized the field providing both a conceptual framework and a powerful calculational tool. On the experimental side, the diversity, quantity and accuracy of the data collected in the last few years at Belle, BESIII and at LHC experiments is impressive, featuring the observation of new states and new unexpected processes. I will discuss these theoretical and experimental advancements and their implications for our understanding of strong interactions.
dias
March 9, 2015
**
CP Violation in the Leptonic Sector by Gustavo Castelo-Branco (Lisbon, IST)
**
We review CP violation in the Standard Model, with emphasis on the leptonic sector. A method to study CP violation is described, including the derivation of weak-basis invariants relevant to both Dirac-type and Majorana-type CP violation. Furthermore, we propose that the observed large leptonic mixing may just reflect a quasi-degeneracy of three Majorana neutrinos. The limit of exact degeneracy of Majorana neutrinos is not trivial, as leptonic mixing and even CP violation may occur. We conjecture that the smallness of |U13|, when compared to the other elements of UPMNS, may be related to the fact that, in the limit of exact mass degeneracy, the leptonic mixing matrix necessarily has a vanishing element. We show that the lifting of the mass degeneracy can lead to the measured value of |U13| while at the same time accommodating the observed solar and atmospheric mixing angles.
dias
May 22, 2014 at 16:30
**
Dynamical mass generation by gauge flavor dynamics by Jiří Hošek (NPI)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 22, 2014 at 15:40
**
Dark matter searches and astrophysical neutrinos in IceCube by Jason Koskinen (NBI)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 22, 2014 at 14:20
**
Theta dependence of 4D SU(N) gauge theories by Ettore Vicari (Pisa)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 22, 2014 at 13:30
**
Constraints on matter from asymptotic safety by Roberto Percacci (SISSA)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 22, 2014 at 11:10
**
Chiral symmetry and Quarkyonic vs. Superfluid/Color-Supercondor phases in SU(N) gauge theories at high density by Terry Tomboulis (UCLA)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 22, 2014 at 10:20
**
On massive gauge theories beyond perturbation theory by Pilar Hernández Gamazo (Valencia)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 22, 2014 at 9:00
**
Exploring the Universe at the highest energies with the Pierre Auger Observatory by Karl-Heinz Kampert (Wuppertal)
**
MASS 2014 Talks Thursday May 22, 2014 Much progress has been made in observations of the most energetic particles in Nature but major puzzles remain to be solved. In particular, a flux suppression of cosmic rays has been observed above 5x10^19 eV, such as expected from photo-pion production by protons propagating through the CMB (GZK-effect). However, data from the Pierre Auger Observatory, the worlds largest cosmic ray observatory located in Argentina, show a shift towards heavier primary particles above 5x10^18 eV and suggest seeing the maximum energy of cosmic particle accelerators rather than energy losses by propagation effects. We shall review the experimental data and discuss its consequences. Observing particles up to 10^20 eV enable tests also of particle and of fundamental physics, such as features of hadronic interaction at energies up to sqrt(s)=100 TeV, as well as tests Lorentz invariance and smoothness of space-time structure. We shall end the presentation by outlining plans for the near-term future and discussing the prospects and future challenges of UHECR physics. [/flvcp3] We discuss the simplest non-perturbative formulation of a massive SU(2) gauge theory on the lattice, which is equivalent to a non-linear chiral model. We search for lines of constant physics and find a scaling region where both a triplet vector and singlet scalar remain light. We discuss the structure of the effective theory describing the dynamics of these light degrees of freedom. [/flvcp3] The regime of (asymptotically) high quark chemical potential $\mu$ is of great physical interest; arguments over many years have suggested the possibility of superfluidity or color superconductivity phases in this region of the phase diagram. This large $\mu$ regime, however, has been largely inaccessible to direct numerical simulation due to the complex fermion determinant problem. Even in the case of theories with real determinant, such as two-color QCD, MC simulations with light fermions appear at least an order of magnitude more challenging than at zero density. In recent years concrete results have been obtained on the lattice starting from the strong coupling end by a combination of simulations in special partition function representations, sophisticated mean field analysis, and simulations in two-color QCD. Recently, cluster expansions shown to converge at large $\mu$ have produce definitive results at strong coupling. After reviewing these results we will show how the cluster expansion method can be extended to all gauge couplings in the case of theories with real determinant and discuss the resulting physical picture. [/flvcp3] The existence of a nontrivial fixed point with finitely many relevant directions is a sufficient condition for an UV complete and predictive QFT. There is evidence for the existence of such a fixed point for pure gravity. I will discuss constraints on the number of scalar, fermion and vector fields minimally coupled to gravity, arising from the existence of the fixed point. [/flvcp3] The dependence of 4D SU(N) gauge theories on the topological theta term is discussed at zero and finite temperature, in particular in the large-N limit. General arguments and numerical analyses (exploiting the lattice formulation) show that the theta dependence drastically changes across the deconfinement transition. The low-T phase is characterized by a large-N scaling with theta/N as relevant variable, while in the high-T phase the scaling variable is just theta and the free energy is essentially determined by the instanton-gas approximation. [/flvcp3] Abstract: The IceCube neutrino observatory at the South Pole includes a cubic kilometer of instrumented ice which serves as a unique telescope for exploring the cosmos. The physics portfolio of the project covers searches for neutrino emission from the annihilation of dark matter and the observation of astrophysical neutrinos and searches for their possible sources. I will cover the most recent dark matter results in addition to the IceCube astrophysical neutrino results. I will conclude with prospects for next generation detector upgrades that will improve sensitivity at the both the O(1) GeV and > O(100) TeV energies. [/flvcp3] See arXiv:1401.7503. [/flvcp3]
dias
May 21, 2014 at 16:30
**
Scale invariant extensions of the SM with strongly interacting hidden sector by Pyungwon Ko (KIAS)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 21, 2014 at 15:40
**
Progress towards an a-theorem by Ian Jack (Liverpool)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 21, 2014 at 14:20
**
Exact Scale Breaking and Novel Higgs Potentials by Steven Abel (Durham IPPP)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 21, 2014 at 13:30
**
Axion-like Particles from Strings by Andreas Ringwald (DESY)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 21, 2014 at 11:10
**
Conformal Electroweak Symmetry Breaking and implications for neutrinos and dark matter by Manfred Lindner (MPI, Heidelberg)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 21, 2014 at 10:20
**
WISPy Cold Dark Matter by Joerg Jaeckel (Heidelberg)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 21, 2014 at 9:00
**
Shedding light on (WIMP) dark matter with LUX by Henrique Araujo (Imperial College London)
**
MASS 2014 Talks Wednesday May 21, 2014 The Large Underground Xenon experiment is searching for interactions of galactic dark matter particles in a 250 kg liquid xenon target. LUX features a double-phase xenon Time Projection Chamber at its core, and operates in a low background environment at the 4850-ft level of the Sanford Underground Research Facility, South Dakota, USA. Results from its first science run completed in 2013 put new constraints on the elastic scattering of Weakly Interacting Massive Particles (WIMPs) off nucleons. Very low energy threshold for nuclear recoil detection and novel calibration techniques have allowed a 20-fold improvement in sensitivity for low mass WIMPs relative to the previous leading experiment, changing the landscape of direct searches for light WIMPs. The null result from LUX can only be reconciled with controversial signal claims by other experiments under the most contrived set of astrophysical, particle physics and experimental assumptions. I will describe the experiment and this significant result, and discuss future prospects as LUX enters a longer science run in 2014. [/flvcp3] Very light bosons, produced non-thermally in the early Universe are an intriguing possibility for the cold dark matter of the Universe. Particularly interesting candidates are axions, axion-like particles and hidden photons. This talk will discuss the current status of such light dark matter with a particular emphasis towards opportunities for its detection. [/flvcp3] New ideas about the role of conformal symmetry for electro-weak symmetry breaking will be discussed in general and some models will be described in detail. Some interesting implications for neutrino physics and dark matter will also be discussed. [/flvcp3] There are various puzzling astrophysical and cosmological phenomena which may be explained by the existence of light axion-like particles (ALPs) with a tiny coupling to two photons. For example, the anomalous transparency of the universe for gamma rays may be explained by oscillations of photons into sub-microeV mass ALPs (and vice versa) in ambient magnetic fields and a recently found unidentified X-ray line may arise from the two photon decay of a keV mass ALP comprising a part or even the total of dark matter. In this talk, we will discuss how such ALPs may arise naturally from strings. [/flvcp3] We present a gauge mediation principle for theories where exact UV scale invariance is broken in a hidden sector. The relevant configurations are those in which the visible sector and a hidden sector emanate from a scale invariant pair of UV theories that communicate only via gauge interactions. We compute the relevant operators of the Higgs sector (which arise at two and three loops). The potential contains logarithmic mass-squared terms which lead to three different low energy configurations. In the first the Higgs sector is the same as that of the usual Standard Model, with the negative Higgs mass-squared arising naturally from radiative corrections. The second has dominant logarithmic mass-squared terms for the Higgs, allowing the electroweak symmetry breaking minimum to be at zero vacuum energy or metastable. In the third configuration the effective potential has negligible quartic term, and yet electroweak symmetry is broken radiatively by a "running-Higgs-mass-squared". The phenomenology of the two new configurations is identical to that of the Standard Model, except for the Higgs self-couplings which are substantially different. [/flvcp3] We discuss recent progress towards an a-theorem governing renormalisation-group flow in four-dimensional quantum field theories, focussing on explicit perturbative results. We also discuss the evidence for an explicit all-orders a-function in supersymmetric theories. [/flvcp3] [/flvcp3]
dias
May 20, 2014 at 11:10
**
Compositeness and Lattice Strong Dynamics by Pavlos M. Vranas (LLNL)
**
MASS 2014 Talks Tuesday May 20, 2014 Neutrinos may be Majorana particles. If so, neutrino less double beta decay processes could be observed by the next generation of bb0nu experiments. I will briefly review the state of the art, then discuss one of the most promising ideas in the field, the use of Hight Pressure Gas Xenon TPC (HPGXe) with electroluminescence gain and optical readout. A 100 kg incarnation of such a device will start operations at the Canfranc Underground Lab in Spain in 2015. The technology can be extrapolated to 1 ton, and thus lead the exploration of the inverse hierarchy in Majorana landscape. [/flvcp3] With the discovery of a Higgs-like particle at the LHC we are leaving through a unique time in which unprecedented experimental means and expertise are matched by the results of decades of theoretical efforts to provide the most accurate description of collider data. The evidence for this new particle has given us some crucial hints to understand the nature of the electroweak interactions, and the accurate determination of its properties could provide further indirect evidence of new physics. In this talk I will review some of the theoretical developments that have played a crucial role in the discovery of a Higgs boson and will be essential in measuring its properties. [/flvcp3] Dark matter may be composite, made up of electroweak charged constituents, bound by a new strong force so that the composite particle is neutral and has diminishingly small interactions with ordinary matter. In addition, the breaking of electroweak symmetry and the emergence of the Higgs particle may be the result of spontaneous chiral symmetry breaking of a new underlying strongly interacting theory. These can be gauge theories with certain number of colors, flavors and fermion representations. In that case, their strong dynamics can be studied using Lattice Gauge Theory methods very much like Lattice QCD. Here I will present lattice simulation results from the Lattice Strong Dynamics (LSD) collaboration on possible composite dark matter models and the associated experimental exclusions, as well as results on conformality and compositeness for strongly interacting theories of electroweak symmetry breaking. [/flvcp3]
dias
May 20, 2014 at 10:20
**
Higgs-boson phenomenology: from discovery to precision physics by Laura Reina (Florida)
**
MASS 2014 Talks Tuesday May 20, 2014 Neutrinos may be Majorana particles. If so, neutrino less double beta decay processes could be observed by the next generation of bb0nu experiments. I will briefly review the state of the art, then discuss one of the most promising ideas in the field, the use of Hight Pressure Gas Xenon TPC (HPGXe) with electroluminescence gain and optical readout. A 100 kg incarnation of such a device will start operations at the Canfranc Underground Lab in Spain in 2015. The technology can be extrapolated to 1 ton, and thus lead the exploration of the inverse hierarchy in Majorana landscape. [/flvcp3] With the discovery of a Higgs-like particle at the LHC we are leaving through a unique time in which unprecedented experimental means and expertise are matched by the results of decades of theoretical efforts to provide the most accurate description of collider data. The evidence for this new particle has given us some crucial hints to understand the nature of the electroweak interactions, and the accurate determination of its properties could provide further indirect evidence of new physics. In this talk I will review some of the theoretical developments that have played a crucial role in the discovery of a Higgs boson and will be essential in measuring its properties. [/flvcp3] Dark matter may be composite, made up of electroweak charged constituents, bound by a new strong force so that the composite particle is neutral and has diminishingly small interactions with ordinary matter. In addition, the breaking of electroweak symmetry and the emergence of the Higgs particle may be the result of spontaneous chiral symmetry breaking of a new underlying strongly interacting theory. These can be gauge theories with certain number of colors, flavors and fermion representations. In that case, their strong dynamics can be studied using Lattice Gauge Theory methods very much like Lattice QCD. Here I will present lattice simulation results from the Lattice Strong Dynamics (LSD) collaboration on possible composite dark matter models and the associated experimental exclusions, as well as results on conformality and compositeness for strongly interacting theories of electroweak symmetry breaking. [/flvcp3]
dias
May 20, 2014 at 9:00
**
The @next neutrinoless double beta decay experiment by Juan José Gómez-Cadenas (IFIC (CSIC & UVEG))
**
MASS 2014 Talks Tuesday May 20, 2014 Neutrinos may be Majorana particles. If so, neutrino less double beta decay processes could be observed by the next generation of bb0nu experiments. I will briefly review the state of the art, then discuss one of the most promising ideas in the field, the use of Hight Pressure Gas Xenon TPC (HPGXe) with electroluminescence gain and optical readout. A 100 kg incarnation of such a device will start operations at the Canfranc Underground Lab in Spain in 2015. The technology can be extrapolated to 1 ton, and thus lead the exploration of the inverse hierarchy in Majorana landscape. [/flvcp3] With the discovery of a Higgs-like particle at the LHC we are leaving through a unique time in which unprecedented experimental means and expertise are matched by the results of decades of theoretical efforts to provide the most accurate description of collider data. The evidence for this new particle has given us some crucial hints to understand the nature of the electroweak interactions, and the accurate determination of its properties could provide further indirect evidence of new physics. In this talk I will review some of the theoretical developments that have played a crucial role in the discovery of a Higgs boson and will be essential in measuring its properties. [/flvcp3] Dark matter may be composite, made up of electroweak charged constituents, bound by a new strong force so that the composite particle is neutral and has diminishingly small interactions with ordinary matter. In addition, the breaking of electroweak symmetry and the emergence of the Higgs particle may be the result of spontaneous chiral symmetry breaking of a new underlying strongly interacting theory. These can be gauge theories with certain number of colors, flavors and fermion representations. In that case, their strong dynamics can be studied using Lattice Gauge Theory methods very much like Lattice QCD. Here I will present lattice simulation results from the Lattice Strong Dynamics (LSD) collaboration on possible composite dark matter models and the associated experimental exclusions, as well as results on conformality and compositeness for strongly interacting theories of electroweak symmetry breaking. [/flvcp3]
dias
May 19, 2014 at 16:30
**
Lattice Radial Quantization by George T. Fleming (Yale University)
**
MASS 2014 Talks Monday May 19, 2014 Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for the Dark Matter, and are subject of increasing interest by experimentalists. I will present the different experimental strategies to detect these particles, and I will briefly review their current status and future prospects. Then I will focus on the International Axion Observatory (IAXO), the most ambitious project currently under consideration. IAXO will be a fourth generation axion helioscope. As its primary physics goal, IAXO will look for axions or ALPs originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal to background ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, the most sensitive axion helioscope to- date. IAXO has also potential to host additional detection setups. Most interestingly, the large magnetic volume of IAXO could be used to detect relic axion or ALPs potentially composing the galactic halo of Dark Matter. IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. [/flvcp3] While elementary particles get their mass from a Higgs-like mechanism, the origin of the mass of ordinary matter is non-perturbative, strong interaction dynamics. This has been unambiguously confirmed in the last few years, thanks to the tremendous progress undergone by ab-initio calculations in lattice quantum chromodynamics (QCD). After reviewing this progress, I will show how lattice QCD is allowing us to investigate many different aspects of mass. These applications range from providing the theory required to "measure" quark masses, to explaining important aspects of the stability of ordinary matter, through determining the coupling of possible WIMP dark matter, which could constitute 85% of the total matter in the universe, to the ordinary matter of WIMP detectors. [/flvcp3] The insular nature of the Standard Model may be explained if the Higgs potential is only sensitive to quantum corrections from masses associated with physical states. Starting from a scale-free electroweak sector, we show that heavy right-handed neutrinos can be the origin of mass for scalar dark matter, in a framework with two scalar doublets. In turn, below the mass of heavy neutrinos, the dark matter sector sets the scale of electroweak symmetry breaking. The successive transmission of mass scale from right-handed neutrinos occurs at the quantum level. This framework includes all the necessary ingredients to provide a viable dark matter candidate, realistic light neutrino masses, and the baryon asymmetry of the Universe via thermal leptogenesis. [/flvcp3] Do interacting UV fixed points exist, and if so, what can we do with them? The talk by Daniel Litim (Sussex) will be available later. I will discuss how imposing the successful leptogenesis bound one obtains interesting constraints on those high energy parameters characterising right-handed (RH) neutrino parameters in the see-saw mechanism. This provides a useful guidance among the many existing models especially when a condition of independence of the initial conditions is further added (strong thermal leptogenesis condition). In this case a particular (hierarchical) RH neutrino mass spectrum is singled out that, interestingly, is realised in SO(10)-inspired models. I will also discuss how the strong thermal leptogenesis condition by itself (i.e. model independently) favours values of the absolute neutrino mass scale that imply deviations from the hierarchical limit that might be experimentally detected in absolute neutrino mass scale experiments, especially in the case of normally ordered light neutrinos. In this way, leptogenesis acts as an important tool to connect low energy neutrino data to models. [/flvcp3] QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the non-perturbative tensor structures of the quark-gluon vertex. [/flvcp3] I present the current status of a program to formulate D-dimensional strongly-coupled relativistic quantum field theories on lattice discretizations of cylindrical manifolds whose cross-section is a (D-1)-dimensional sphere. Critical points in such theories should correspond to Conformal Field Theories (CFTs) if the full rotational symmetry of the sphere can be recovered in the continuum limit. If the formulation is successful, studying these CFTs should be numerically much less expensive that the equivalent calculations on a D-dimensional torus. [/flvcp3] Conformal bootstrap in 4D The talk by Oleg Antipin (INFN) will be available later.
dias
May 19, 2014 at 15:40
**
Non-perturbative propagators and running coupling in the conformal window of QCD by Reinhard Alkofer (Graz)
**
MASS 2014 Talks Monday May 19, 2014 Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for the Dark Matter, and are subject of increasing interest by experimentalists. I will present the different experimental strategies to detect these particles, and I will briefly review their current status and future prospects. Then I will focus on the International Axion Observatory (IAXO), the most ambitious project currently under consideration. IAXO will be a fourth generation axion helioscope. As its primary physics goal, IAXO will look for axions or ALPs originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal to background ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, the most sensitive axion helioscope to- date. IAXO has also potential to host additional detection setups. Most interestingly, the large magnetic volume of IAXO could be used to detect relic axion or ALPs potentially composing the galactic halo of Dark Matter. IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. [/flvcp3] While elementary particles get their mass from a Higgs-like mechanism, the origin of the mass of ordinary matter is non-perturbative, strong interaction dynamics. This has been unambiguously confirmed in the last few years, thanks to the tremendous progress undergone by ab-initio calculations in lattice quantum chromodynamics (QCD). After reviewing this progress, I will show how lattice QCD is allowing us to investigate many different aspects of mass. These applications range from providing the theory required to "measure" quark masses, to explaining important aspects of the stability of ordinary matter, through determining the coupling of possible WIMP dark matter, which could constitute 85% of the total matter in the universe, to the ordinary matter of WIMP detectors. [/flvcp3] The insular nature of the Standard Model may be explained if the Higgs potential is only sensitive to quantum corrections from masses associated with physical states. Starting from a scale-free electroweak sector, we show that heavy right-handed neutrinos can be the origin of mass for scalar dark matter, in a framework with two scalar doublets. In turn, below the mass of heavy neutrinos, the dark matter sector sets the scale of electroweak symmetry breaking. The successive transmission of mass scale from right-handed neutrinos occurs at the quantum level. This framework includes all the necessary ingredients to provide a viable dark matter candidate, realistic light neutrino masses, and the baryon asymmetry of the Universe via thermal leptogenesis. [/flvcp3] Do interacting UV fixed points exist, and if so, what can we do with them? The talk by Daniel Litim (Sussex) will be available later. I will discuss how imposing the successful leptogenesis bound one obtains interesting constraints on those high energy parameters characterising right-handed (RH) neutrino parameters in the see-saw mechanism. This provides a useful guidance among the many existing models especially when a condition of independence of the initial conditions is further added (strong thermal leptogenesis condition). In this case a particular (hierarchical) RH neutrino mass spectrum is singled out that, interestingly, is realised in SO(10)-inspired models. I will also discuss how the strong thermal leptogenesis condition by itself (i.e. model independently) favours values of the absolute neutrino mass scale that imply deviations from the hierarchical limit that might be experimentally detected in absolute neutrino mass scale experiments, especially in the case of normally ordered light neutrinos. In this way, leptogenesis acts as an important tool to connect low energy neutrino data to models. [/flvcp3] QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the non-perturbative tensor structures of the quark-gluon vertex. [/flvcp3] I present the current status of a program to formulate D-dimensional strongly-coupled relativistic quantum field theories on lattice discretizations of cylindrical manifolds whose cross-section is a (D-1)-dimensional sphere. Critical points in such theories should correspond to Conformal Field Theories (CFTs) if the full rotational symmetry of the sphere can be recovered in the continuum limit. If the formulation is successful, studying these CFTs should be numerically much less expensive that the equivalent calculations on a D-dimensional torus. [/flvcp3] Conformal bootstrap in 4D The talk by Oleg Antipin (INFN) will be available later.
dias
May 19, 2014 at 14:20
**
From lowe energy neutrino data to mass models (and back) with leptogenesis. by Pasquale Di Bari (Southampton)
**
MASS 2014 Talks Monday May 19, 2014 Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for the Dark Matter, and are subject of increasing interest by experimentalists. I will present the different experimental strategies to detect these particles, and I will briefly review their current status and future prospects. Then I will focus on the International Axion Observatory (IAXO), the most ambitious project currently under consideration. IAXO will be a fourth generation axion helioscope. As its primary physics goal, IAXO will look for axions or ALPs originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal to background ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, the most sensitive axion helioscope to- date. IAXO has also potential to host additional detection setups. Most interestingly, the large magnetic volume of IAXO could be used to detect relic axion or ALPs potentially composing the galactic halo of Dark Matter. IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. [/flvcp3] While elementary particles get their mass from a Higgs-like mechanism, the origin of the mass of ordinary matter is non-perturbative, strong interaction dynamics. This has been unambiguously confirmed in the last few years, thanks to the tremendous progress undergone by ab-initio calculations in lattice quantum chromodynamics (QCD). After reviewing this progress, I will show how lattice QCD is allowing us to investigate many different aspects of mass. These applications range from providing the theory required to "measure" quark masses, to explaining important aspects of the stability of ordinary matter, through determining the coupling of possible WIMP dark matter, which could constitute 85% of the total matter in the universe, to the ordinary matter of WIMP detectors. [/flvcp3] The insular nature of the Standard Model may be explained if the Higgs potential is only sensitive to quantum corrections from masses associated with physical states. Starting from a scale-free electroweak sector, we show that heavy right-handed neutrinos can be the origin of mass for scalar dark matter, in a framework with two scalar doublets. In turn, below the mass of heavy neutrinos, the dark matter sector sets the scale of electroweak symmetry breaking. The successive transmission of mass scale from right-handed neutrinos occurs at the quantum level. This framework includes all the necessary ingredients to provide a viable dark matter candidate, realistic light neutrino masses, and the baryon asymmetry of the Universe via thermal leptogenesis. [/flvcp3] Do interacting UV fixed points exist, and if so, what can we do with them? The talk by Daniel Litim (Sussex) will be available later. I will discuss how imposing the successful leptogenesis bound one obtains interesting constraints on those high energy parameters characterising right-handed (RH) neutrino parameters in the see-saw mechanism. This provides a useful guidance among the many existing models especially when a condition of independence of the initial conditions is further added (strong thermal leptogenesis condition). In this case a particular (hierarchical) RH neutrino mass spectrum is singled out that, interestingly, is realised in SO(10)-inspired models. I will also discuss how the strong thermal leptogenesis condition by itself (i.e. model independently) favours values of the absolute neutrino mass scale that imply deviations from the hierarchical limit that might be experimentally detected in absolute neutrino mass scale experiments, especially in the case of normally ordered light neutrinos. In this way, leptogenesis acts as an important tool to connect low energy neutrino data to models. [/flvcp3] QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the non-perturbative tensor structures of the quark-gluon vertex. [/flvcp3] I present the current status of a program to formulate D-dimensional strongly-coupled relativistic quantum field theories on lattice discretizations of cylindrical manifolds whose cross-section is a (D-1)-dimensional sphere. Critical points in such theories should correspond to Conformal Field Theories (CFTs) if the full rotational symmetry of the sphere can be recovered in the continuum limit. If the formulation is successful, studying these CFTs should be numerically much less expensive that the equivalent calculations on a D-dimensional torus. [/flvcp3] Conformal bootstrap in 4D The talk by Oleg Antipin (INFN) will be available later.
dias
May 19, 2014 at 11:10
**
Right-Handed Neutrinos as the Origin of the Electroweak Scale by Hooman Davoudiasl (BNL)
**
MASS 2014 Talks Monday May 19, 2014 Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for the Dark Matter, and are subject of increasing interest by experimentalists. I will present the different experimental strategies to detect these particles, and I will briefly review their current status and future prospects. Then I will focus on the International Axion Observatory (IAXO), the most ambitious project currently under consideration. IAXO will be a fourth generation axion helioscope. As its primary physics goal, IAXO will look for axions or ALPs originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal to background ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, the most sensitive axion helioscope to- date. IAXO has also potential to host additional detection setups. Most interestingly, the large magnetic volume of IAXO could be used to detect relic axion or ALPs potentially composing the galactic halo of Dark Matter. IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. [/flvcp3] While elementary particles get their mass from a Higgs-like mechanism, the origin of the mass of ordinary matter is non-perturbative, strong interaction dynamics. This has been unambiguously confirmed in the last few years, thanks to the tremendous progress undergone by ab-initio calculations in lattice quantum chromodynamics (QCD). After reviewing this progress, I will show how lattice QCD is allowing us to investigate many different aspects of mass. These applications range from providing the theory required to "measure" quark masses, to explaining important aspects of the stability of ordinary matter, through determining the coupling of possible WIMP dark matter, which could constitute 85% of the total matter in the universe, to the ordinary matter of WIMP detectors. [/flvcp3] The insular nature of the Standard Model may be explained if the Higgs potential is only sensitive to quantum corrections from masses associated with physical states. Starting from a scale-free electroweak sector, we show that heavy right-handed neutrinos can be the origin of mass for scalar dark matter, in a framework with two scalar doublets. In turn, below the mass of heavy neutrinos, the dark matter sector sets the scale of electroweak symmetry breaking. The successive transmission of mass scale from right-handed neutrinos occurs at the quantum level. This framework includes all the necessary ingredients to provide a viable dark matter candidate, realistic light neutrino masses, and the baryon asymmetry of the Universe via thermal leptogenesis. [/flvcp3] Do interacting UV fixed points exist, and if so, what can we do with them? The talk by Daniel Litim (Sussex) will be available later. I will discuss how imposing the successful leptogenesis bound one obtains interesting constraints on those high energy parameters characterising right-handed (RH) neutrino parameters in the see-saw mechanism. This provides a useful guidance among the many existing models especially when a condition of independence of the initial conditions is further added (strong thermal leptogenesis condition). In this case a particular (hierarchical) RH neutrino mass spectrum is singled out that, interestingly, is realised in SO(10)-inspired models. I will also discuss how the strong thermal leptogenesis condition by itself (i.e. model independently) favours values of the absolute neutrino mass scale that imply deviations from the hierarchical limit that might be experimentally detected in absolute neutrino mass scale experiments, especially in the case of normally ordered light neutrinos. In this way, leptogenesis acts as an important tool to connect low energy neutrino data to models. [/flvcp3] QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the non-perturbative tensor structures of the quark-gluon vertex. [/flvcp3] I present the current status of a program to formulate D-dimensional strongly-coupled relativistic quantum field theories on lattice discretizations of cylindrical manifolds whose cross-section is a (D-1)-dimensional sphere. Critical points in such theories should correspond to Conformal Field Theories (CFTs) if the full rotational symmetry of the sphere can be recovered in the continuum limit. If the formulation is successful, studying these CFTs should be numerically much less expensive that the equivalent calculations on a D-dimensional torus. [/flvcp3] Conformal bootstrap in 4D The talk by Oleg Antipin (INFN) will be available later.
dias
May 19, 2014 at 10:20
**
Mass and Lattice QCD by Laurent Lellouch (CPT Marseille, CNRS & Aix-Marseille U)
**
MASS 2014 Talks Monday May 19, 2014 Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for the Dark Matter, and are subject of increasing interest by experimentalists. I will present the different experimental strategies to detect these particles, and I will briefly review their current status and future prospects. Then I will focus on the International Axion Observatory (IAXO), the most ambitious project currently under consideration. IAXO will be a fourth generation axion helioscope. As its primary physics goal, IAXO will look for axions or ALPs originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal to background ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, the most sensitive axion helioscope to- date. IAXO has also potential to host additional detection setups. Most interestingly, the large magnetic volume of IAXO could be used to detect relic axion or ALPs potentially composing the galactic halo of Dark Matter. IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. [/flvcp3] While elementary particles get their mass from a Higgs-like mechanism, the origin of the mass of ordinary matter is non-perturbative, strong interaction dynamics. This has been unambiguously confirmed in the last few years, thanks to the tremendous progress undergone by ab-initio calculations in lattice quantum chromodynamics (QCD). After reviewing this progress, I will show how lattice QCD is allowing us to investigate many different aspects of mass. These applications range from providing the theory required to "measure" quark masses, to explaining important aspects of the stability of ordinary matter, through determining the coupling of possible WIMP dark matter, which could constitute 85% of the total matter in the universe, to the ordinary matter of WIMP detectors. [/flvcp3] The insular nature of the Standard Model may be explained if the Higgs potential is only sensitive to quantum corrections from masses associated with physical states. Starting from a scale-free electroweak sector, we show that heavy right-handed neutrinos can be the origin of mass for scalar dark matter, in a framework with two scalar doublets. In turn, below the mass of heavy neutrinos, the dark matter sector sets the scale of electroweak symmetry breaking. The successive transmission of mass scale from right-handed neutrinos occurs at the quantum level. This framework includes all the necessary ingredients to provide a viable dark matter candidate, realistic light neutrino masses, and the baryon asymmetry of the Universe via thermal leptogenesis. [/flvcp3] Do interacting UV fixed points exist, and if so, what can we do with them? The talk by Daniel Litim (Sussex) will be available later. I will discuss how imposing the successful leptogenesis bound one obtains interesting constraints on those high energy parameters characterising right-handed (RH) neutrino parameters in the see-saw mechanism. This provides a useful guidance among the many existing models especially when a condition of independence of the initial conditions is further added (strong thermal leptogenesis condition). In this case a particular (hierarchical) RH neutrino mass spectrum is singled out that, interestingly, is realised in SO(10)-inspired models. I will also discuss how the strong thermal leptogenesis condition by itself (i.e. model independently) favours values of the absolute neutrino mass scale that imply deviations from the hierarchical limit that might be experimentally detected in absolute neutrino mass scale experiments, especially in the case of normally ordered light neutrinos. In this way, leptogenesis acts as an important tool to connect low energy neutrino data to models. [/flvcp3] QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the non-perturbative tensor structures of the quark-gluon vertex. [/flvcp3] I present the current status of a program to formulate D-dimensional strongly-coupled relativistic quantum field theories on lattice discretizations of cylindrical manifolds whose cross-section is a (D-1)-dimensional sphere. Critical points in such theories should correspond to Conformal Field Theories (CFTs) if the full rotational symmetry of the sphere can be recovered in the continuum limit. If the formulation is successful, studying these CFTs should be numerically much less expensive that the equivalent calculations on a D-dimensional torus. [/flvcp3] Conformal bootstrap in 4D The talk by Oleg Antipin (INFN) will be available later.
dias
May 19, 2014 at 9:00
**
Present and Future of axion searches: the International AXion Observatory IAXO by Igor G. Irastorza (Zaragoza)
**
MASS 2014 Talks Monday May 19, 2014 Axions are a natural consequence of the Peccei-Quinn mechanism, the most compelling solution to the strong-CP problem. Similar axion-like particles (ALPs) also appear in a number of possible extensions of the Standard Model, notably in string theories. Both axions and ALPs are very well motivated candidates for the Dark Matter, and are subject of increasing interest by experimentalists. I will present the different experimental strategies to detect these particles, and I will briefly review their current status and future prospects. Then I will focus on the International Axion Observatory (IAXO), the most ambitious project currently under consideration. IAXO will be a fourth generation axion helioscope. As its primary physics goal, IAXO will look for axions or ALPs originating in the Sun via the Primakoff conversion of the solar plasma photons. In terms of signal to background ratio, IAXO will be about 4-5 orders of magnitude more sensitive than CAST, the most sensitive axion helioscope to- date. IAXO has also potential to host additional detection setups. Most interestingly, the large magnetic volume of IAXO could be used to detect relic axion or ALPs potentially composing the galactic halo of Dark Matter. IAXO has the potential to serve as a multi-purpose facility for generic axion and ALP research in the next decade. [/flvcp3] While elementary particles get their mass from a Higgs-like mechanism, the origin of the mass of ordinary matter is non-perturbative, strong interaction dynamics. This has been unambiguously confirmed in the last few years, thanks to the tremendous progress undergone by ab-initio calculations in lattice quantum chromodynamics (QCD). After reviewing this progress, I will show how lattice QCD is allowing us to investigate many different aspects of mass. These applications range from providing the theory required to "measure" quark masses, to explaining important aspects of the stability of ordinary matter, through determining the coupling of possible WIMP dark matter, which could constitute 85% of the total matter in the universe, to the ordinary matter of WIMP detectors. [/flvcp3] The insular nature of the Standard Model may be explained if the Higgs potential is only sensitive to quantum corrections from masses associated with physical states. Starting from a scale-free electroweak sector, we show that heavy right-handed neutrinos can be the origin of mass for scalar dark matter, in a framework with two scalar doublets. In turn, below the mass of heavy neutrinos, the dark matter sector sets the scale of electroweak symmetry breaking. The successive transmission of mass scale from right-handed neutrinos occurs at the quantum level. This framework includes all the necessary ingredients to provide a viable dark matter candidate, realistic light neutrino masses, and the baryon asymmetry of the Universe via thermal leptogenesis. [/flvcp3] Do interacting UV fixed points exist, and if so, what can we do with them? The talk by Daniel Litim (Sussex) will be available later. I will discuss how imposing the successful leptogenesis bound one obtains interesting constraints on those high energy parameters characterising right-handed (RH) neutrino parameters in the see-saw mechanism. This provides a useful guidance among the many existing models especially when a condition of independence of the initial conditions is further added (strong thermal leptogenesis condition). In this case a particular (hierarchical) RH neutrino mass spectrum is singled out that, interestingly, is realised in SO(10)-inspired models. I will also discuss how the strong thermal leptogenesis condition by itself (i.e. model independently) favours values of the absolute neutrino mass scale that imply deviations from the hierarchical limit that might be experimentally detected in absolute neutrino mass scale experiments, especially in the case of normally ordered light neutrinos. In this way, leptogenesis acts as an important tool to connect low energy neutrino data to models. [/flvcp3] QCD with a relatively large number of fundamentally charged quark flavours in the chiral limit is considered. A self-consistent solution of the quark, gluon and ghost propagator Dyson-Schwinger equations in Landau gauge exhibits a phase transition. Above the critical number of fermion flavours the non-perturbative running coupling develops a plateau over a wide momentum range, and the propagators follow a power law behaviour for these momenta. Hereby, the critical number of quark flavours depends crucially on the non-perturbative tensor structures of the quark-gluon vertex. [/flvcp3] I present the current status of a program to formulate D-dimensional strongly-coupled relativistic quantum field theories on lattice discretizations of cylindrical manifolds whose cross-section is a (D-1)-dimensional sphere. Critical points in such theories should correspond to Conformal Field Theories (CFTs) if the full rotational symmetry of the sphere can be recovered in the continuum limit. If the formulation is successful, studying these CFTs should be numerically much less expensive that the equivalent calculations on a D-dimensional torus. [/flvcp3] Conformal bootstrap in 4D The talk by Oleg Antipin (INFN) will be available later.
dias
December 16, 2013 at 16:00
**
An Introduction to the Brout-Englert-Higgs Mechanism by Diego Becciolini (CP3-Origins)
**
The discovery of a new particle with the right properties to be the so-called 'Higgs boson' at the LHC last year was a further confirmation that the Standard Model formulation, with the spontaneous breaking of the Electro-Weak symmetry, is indeed a good description of Nature. Consequently, this year's Nobel Prize in Physics was awarded to François Englert and Peter Higgs “for the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the discovery of the predicted fundamental particle, by the ATLAS and CMS experiments at CERN’s Large Hadron Collider”. In this lecture I will try to give an overview, at a very basic level, of the main technical ideas that underline the BEH mechanism: what mass means, what symmetry breaking means, what gauge symmetries are, and finally what happens when combining the latter two ingredients... It is a simple repetition of the lecture I gave in November to allow more people to attend. The talk is intended for our genius students, but everybody is welcome. Here are some problems for you to work on after the lecture.
dias
November 25, 2013
**
SUSY naturalness without prejudice by Dumitru Ghilencea (CERN & NIPNE Bucharest)
**
Unlike the Standard Model, supersymmetric models stabilize the EW scale v and predict that it is function of the SUSY UV parameters (p_i). I provide a comparative study of the EW fine tuning Delta (measuring this stability) in the most popular SUSY models consistent with recent LHC results for the Higgs sector. I show that if one insists on fixing the EW scale v=v(p_i) to its numerical value, the likelihood to fit the EW data is suppressed by Delta (under some assumptions). From this, the condition of a good fit provides an estimate of a model-independent bound for the EW scale fine-tuning: Delta<<exp(d.o.f./2), (d.o.f. = number of the degrees of freedom). Popular SUSY models: CMSSM, NUHM1, NUHM2, NMSSM, and MSSM with non-universal gaugino masses are examined, to see if this bound on Delta is respected. A more general approach shows that the covariance matrix of a model encodes all the information about the EW fine tuning provided that v=v(p_i) and is therefore more fundamental than Delta. The latter may thus be less relevant for the viability of a model, as long as with v=v(p_i) a good fit of the data is still possible.
dias
October 14, 2013
**
The Scale of Dark QCD by Pedro Schwaller (CERN)
**
Most of the mass of ordinary matter has its origin from quantum chromodynamics (QCD). A similar strong dynamics, dark QCD, could exist to explain the mass origin of dark matter. Using infrared fixed points of the two gauge couplings, we provide a dynamical mechanism that relates the dark QCD confinement scale to our QCD scale, and hence provides an explanation for comparable dark baryon and proton masses. Together with a mechanism that generates equal amounts of dark baryon and ordinary baryon asymmetries in the early universe, the similarity of dark matter and ordinary matter energy densities is naturally explained. For a large class of gauge group representations, the particles charged under both QCD and dark QCD, necessary ingredients for generating the infrared fixed points, are found to have TeV scale masses, which sets the scale for dark matter direct detection and novel collider signatures involving visible and dark jets. Based on arxiv:1306:4676 with Y. Bai.
dias
September 30, 2013
**
Inflation on Random Landscapes by Thorsten Battefeld (University of Göttingen, Germany)
**
Moduli spaces in string theory, often dubbed Landscapes, are usually of high dimensionality and feature a complicated potential. Is multi-field inflation on such landscapes consistent with current observations by PLANCK? Modeling such landscapes by random potentials offers the opportunity to asses generic features of inflation. Random matrix theory provides a tool (complementing numerical experiments) to address many questions analytically, without requiring a detailed knowledge of the potential, i.e. details of the compactification, due to the feature of universality. Thus, the generic prediction of a landscape in string theory can be put to the test. I will discuss the preference of saddle point inflation in a class of landscapes, commenting on the role of eternal inflation, anthropic arguments and the measure problem within this framework. As an application, I will discuss how current constraints on non-Gaussianities impose bounds on the curvature of the end-of-inflation hyper-surface in this class of models, which in turn imposes constraints on the topography of the landscape.
dias
June 24, 2013
**
Flavor violating Higgs decays by Joachim Kopp (Max Planck Institut fur Kernphysik (MPI))
**
The discovery of a Higgs-like boson by ATLAS and CMS has opened up a new window to physics beyond the Standard Model. A particularly interesting class of new observables are flavour violating couplings of the Higgs boson to quarks or leptons, which are generically expected in many extensions of the Standard Model, for instance in multi-Higgs doublet models, extra-dimensional scenarios, and models of compositeness. In this talk, we present a comprehensive set of constraints on flavour violating Higgs couplings using data on rare decays, meson oscillations, dipole moments and other precision observables. While these low-energy constraints are very strong for processes involving only electrons, muons or light quarks, Higgs couplings to top quarks and tau leptons can still be very large. In fact, the strongest limits on processes like t -> h q, h -> tau mu and h -> tau e are already coming from the LHC. We derive concrete bounds on h -> tau mu and h -> tau e by recasting the ATLAS search for h -> tau tau, and we demonstrate how a dedicated search for lepton flavour violating Higgs decays can achieve a substantially improved sensitivity even with existing data alone.
dias
June 3, 2013
**
Unleashing Feedback: Galaxies and AGN by Joe Silk (IAP, JHU & Oxford University)
**
Progress has been made in understanding the origin of spiral galaxies, but elliptical galaxy formation continues to pose unresolved problems. In both cases, feedback seems to be a central issue. I will review our understanding of feedback, on scales from stars to galaxies. I will focus on massive spheroids, where one invariably finds evidence for the presence of supermassive black holes. These are often visible, especially at early epochs, as active galactic nuclei. Negative feedback, due to the outflow from the central black hole during its accretion phase, quenches the gas supply to the spheroid. Is there an earlier period of feedback during protogalaxy formation that could result in an efficient phase of early black hole growth and star formation? Are there observational implications of AGN triggering of star formation? I will discuss some of these issues in this talk.
dias
November 5, 2012
**
QCD resummation techniques applied to beyond the standard model physics by Benjamin Fuks (University of Strasbourg)
**
When studying the transverse-momentum (pT) distribution of a produced colorless final state, it is convenient to separate the large- and small-pT regions. For the large values of pT, the use of the fixed-order perturbation theory is fully justified, but in the small-pT region, the coefficients of the perturbative expansion are enhanced by powers of large logarithmic terms. Furthermore, at the production threshold, the mismatch between virtual corrections and phase-space suppressed real-gluon emission leads also to the appearance of large logarithmic terms. Accurate theoretical calculations must then include soft-gluon resummation in order to obtain reliable perturbative predictions and properly take these logarithms into account. We present precision calculations for slepton-pair, gaugino-pair and Z’ production at hadron colliders, matching transverse-momentum spectra, invariant-mass distributions and total cross sections obtained with the use of resummation with those obtained through pure perturbative calculations. We compare then the resummed results with those provided by Monte Carlo generators such as MC@NLO, PYTHIA or MadGraph (including a matching a la MLM), and study the impact of scale variations, parton densities, and non-perturbative effects.
dias
October 12, 2012 at 11:30
**
Ultra-High Energy Cosmic Rays III by Peter Tinyakov (Université Libre de Bruxelles)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 12, 2012 at 10:00
**
Phenomenology of Technicolor III by Roshan Foadi (CP3, Université Catholique de Louvain)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 12, 2012 at 9:00
**
Inﬂation and Cosmology Perturbations III by David Langlois (APC Paris)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 11, 2012 at 15:15
**
Phenomenology of Technicolor II by Roshan Foadi (CP3, Université Catholique de Louvain)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 11, 2012 at 14:00
**
Phases of Gauge Theories III by Thomas Ryttov (Jefferson Physical Laboratory, Harvard University)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 11, 2012 at 11:30
**
Ultra-High Energy Cosmic Rays II by Peter Tinyakov (Université Libre de Bruxelles)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 11, 2012 at 10:00
**
An Introduction to Dark Matter III by Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 11, 2012 at 9:00
**
Inﬂation and Cosmology Perturbations II by David Langlois (APC Paris)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 10, 2012 at 11:30
**
Inﬂation and Cosmology Perturbations I by David Langlois (APC Paris)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 10, 2012 at 10:00
**
An Introduction to Dark Matter II by Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 10, 2012 at 9:00
**
Supersymmetry and Supergravity III by Alex Kehagias (National Technical University of Athens)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 9, 2012 at 15:15
**
Phenomenology of Technicolor I by Roshan Foadi (CP3, Université Catholique de Louvain)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 9, 2012 at 14:00
**
An Introduction to Dark Matter I by Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 9, 2012 at 11:30
**
Supersymmetry and Supergravity II by Alex Kehagias (National Technical University of Athens)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 9, 2012 at 10:00
**
Supersymmetry and Supergravity I by Alex Kehagias (National Technical University of Athens)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 9, 2012 at 9:00
**
Phases of Gauge Theories II by Thomas Ryttov (Jefferson Physical Laboratory, Harvard University)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 8, 2012 at 11:30
**
Phases of Gauge Theories I by Thomas Ryttov (Jefferson Physical Laboratory, Harvard University)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 8, 2012 at 10:00
**
Ultra-High Energy Cosmic Rays I by Peter Tinyakov (Université Libre de Bruxelles)
**
Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
October 8, 2012 at 9:45
**
Winter School 2012 Opening Remarks by Chris Kouvaris (CP3-Origins)
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Talks Slides and Notes Roshan Foadi (CP3, Université Catholique de Louvain) Phenomenology of Technicolor (slides not available yet) Alex Kehagias (National Technical University of Athens): Notes on Supersymmetry and Supergravity David Langlois (APC Paris) Inﬂation and Cosmology Perturbations Thomas Ryttov (Jefferson Physical Laboratory, Harvard University): Phases of Gauge Theories Pasquale Serpico (Annecy Le Vieux Theoretical Physics Laboratory) An Introduction to Dark Matter - part I, part II, and part III Peter Tinyakov (Université Libre de Bruxelles) Ultra-High Energy Cosmic Rays Monday, October 8, 2012 Tuesday, October 9, 2012 Wednesday, October 10, 2012 Thursday, October 11, 2012 Friday, October 12, 2012
dias
May 24, 2012
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Cutoffs, Stretched Horizons and Black Hole Radiators by Nemanja Kaloper (UC Davis, California)
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We argue that if the UV cutoff of the IR theory is of the order, or below, the scale of the stretched horizon in a black hole background, which in turn is significantly lower than the Planck scale, the black hole radiance is controlled by the UV completion of the field theory. In particular, if the UV completion of the theory involves degrees of freedom which cannot be efficiently emitted by the black hole, the naive radiance rate estimated by the counting of the IR degrees of freedom may be dramatically reduced. If we apply this argument to the RS2 brane world, it implies that the emission rates of the low energy CFT modes will be dramatically suppressed: its UV completion is given by the bulk gravity on $AdS_5 \times S^5$, and the only bulk modes that could be emitted by a black hole are the s-waves of bulk modes with small 4D masses. But their emission is suppressed by bulk warping. This lowers the radiation rate much below the IR estimate, and follows directly from low CFT cutoff $\mu \sim L^{-1} \ll M_{Pl}$, a large number of modes $N \gg 1$ and the fact that 4D gravity in RS2 is induced, $M_{Pl}^2 \simeq N \mu^2$.
dias
December 8, 2011
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1st CP3 meeting on ethics and responsible conduct in research by Dominique Bouchet
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Professor Dominique Bouchet from the Department of Marketing and Management, SDU, will give a seminar introducing the ethical implications of being researcher and the consequences of misconduct in research. Science and scientific research have, today more than ever, a huge impact on society, culture, and on the way people perceive themselves and the reality around them. For this reason, scientists have big responsibilities and must perform their work as fairly as possible. Any negligence could have enormous consequences on other researcher’s work and on technology development, it causes financial losses and it constitutes a threat to the level of thrust attributed to research in general. Recently the media focused on a serious case of misconduct in scientific research that happened in Denmark, involving falsification of research data. Although being an extreme behaviour, intentional acts like these do not exhaust the list of possible negligences in research. In fact sometimes people do wrong even when they do not mean to, just because they are not properly aware of the implications and consequences of their behaviour. We decided therefore to go deeper in our understanding of the implications of our job, to get more self-awareness and work in a more responsible and conscious way. See also the related news for further details.
dias
August 4, 2011
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Flavour Physics Beyond the Standard Model by Federico Mescia (University of Barcelona)
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I will present a summary of what we learned so far from low-energy flavour-quark observables, concerning physics beyond the Standard Model (SM). In the last few years there has been a great experimental progress in quark and lepton flavour physics. In the quark sector, the validity of the SM has been strongly reinforced by a series of challenging tests. More important, several suppressed observables (such as DMBs, sin(2beta), epsK, b->sgamma) potentially sensitive to New Physics (NP) have been measured with good accuracy, showing no deviations from the SM. In constructing a realistic SM extension we should then try to reconcile many non-trivial constraints. The Minimal Flavour Violation hypothesis well handles flavour-quark data and shows, in the large tanbeta scenario, interesting effects to be detected by LHCB.
dias
June 14, 2011
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Dark Energy and the Cosmological Constant Problem by Florian Bauer (Barcelona University)
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Abstract: The currently observed acceleration of the universe may originate from "dark energy", a new component in the energy content of the cosmos. A tiny positive cosmological constant would be the simplest solution, however, it is usually rejected because our well-working particle physics theories suggest a much larger magnitude than observed. Therefore, other sources of acceleration have been considered, e.g. scalar fields, modified gravity, back reaction effects or a misinterpretation of observations. In these setups the cosmological constant is usually set to zero, and the problem is ignored. Different from that, I will discuss some scenarios that aim at providing low curvature solutions despite the existence of a large cosmological constant.
dias
November 2, 2010 at 16:00
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Black Holes in Elementary Physics by Gerard ‘t Hooft (Utrecht University)
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Abstract In Physics, black holes are known as extremely dense forms of matter, of which, from the outside, only the gravitational force can be detected. Astronomers observe such object ate various spots in the Universe. When in laboratories on earth elementary particles are made to collide with the strongest possible force, these collisions are by far not energetic enough to produce black holes. However, we can try to imagine collisions that are so energetic that black holes do form, and then ask ourselves what exactly might happen then. The question is important because it turns out that our theoretical understanding falls short at this point. The gravitational force is so special that all beautiful theories we have today about the particles and the forces between them cannot describe it. Do black holes obey the laws of quantum mechanics? Are black holes also subatomic particles and vice versa? If so, our theories must be revised. This can lead to fundamental new insights about very basic features in physics, and give us new tools to describe space, time, and matter. Professor Gerard 't Hooft Professor Gerard 't Hooft is a theoretical physicist at Utrecht University, the Netherlands. He shared the 1999 Nobel Prize in Physics with Martinus J. G. Veltman for elucidating the quantum structure of electroweak interactions. He was awarded the Lorentz Medal in 1986 and the Spinozapremie in 1995. Public Lecture Prof. 't Hooft gives a lecture on Black Holes in Elementary Physics. The lecture is intended for the general public. Everybody is welcome to attend. You do not need to register for the lecture, and entrance is free. Refreshments will be served before the lecture. More Information The Nobel Lecture is held together with the 3rd Odense Winter School on Geometry and Theoretical Physics - look at the home page of the winter school for travel information, accommodation, etc. Poster A PDF version of our poster can be found by following this link. Media