Lattice QCD, the Standard Model and the quest for New Physics

Who: Michele Della Morte (Instituto de Fisica Corpuscular (IFIC))
When: Wednesday, May 8, 2013 at 10:15
Where: BMB’s seminar room

The Standard Model (SM) of particle interactions describes with good accuracy all experimental results on particle physics in the explored energy region up to the electroweak scale of O(M_W). The LHC experiment offers the unique opportunity to extensively probe scales one order of magnitude larger than it has been possible with previous accelerator facilities.

The direct search of new particles is the main approach to establish New Physics (NP) at the LHC, however indirect searches  provide important complementary informations. In  particular, precision measurements and computations in the flavour physics field  play a key role in constraining any NP model. As these indirect NP effects are expected to be small it is absolutely crucial to perform now precise and rigorous tests of the SM.

My research activity aims at establishing lattice QCD combined with analytical tools such as Chiral Perturbation Theory as the main tool to compute the hadronic parameters entering the SM predictions for some experimentally well measured quantities (e.g. the anomalous magnetic moment of the muon or the  nucleon axial charge) and for processes with expected large sensitivity to NP, especially in the  heavy flavour sector (e.g. rare B decays). In this talk I will discuss the relevance, the target accuracy and the numerical and analytical approaches I am using for these computations, with particular emphasis on the novelty aspects.

In addition I will discuss a new ‘multi-level’ update algorithm I have introduced to pursue a precise  computation of the glueball spectrum in QCD. The existence of glueball  states is a distinctive property of a quantum Non-Abelian gauge theory, however these states have so far escaped a reliable identification at experiments such as JLAB, BES or FAIR.