Symmetries and composite dynamics for the 750 GeV diphoton excess

Preprint number: CP3-Origins-2016-13 DNRF90 and DIAS-2016-13
Authors: Mads Toudal Frandsen (CP3-Origins & DIAS) and Diogo Buarque Franzosi (II. Physikalisches Institut, Universitat Gottingen)
External link: arXiv.org

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The ATLAS and CMS experiments at LHC observe small excesses of diphoton events with invari-
ant mass around 750 GeV. Here we study the possibility of nearly parity degenerate and vector-scalar
degenerate spectra as well as composite dynamics in 2 scenarios for explaining the excess: Produc-
tion of a pseudo-scalar via gluon or photon fusion or via decay of a parent particle together with
soft additional nal states. We discuss possible underlying realizations of the scenarios motivated
by dynamical models of electroweak symmetry breaking (without new coloured states) and fermion
masses.