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)
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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