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We show that quarkonia-like states of a hidden SU(N) gauge group can accountfor the 750 GeV diphoton excess observed by ATLAS and CMS, even withconstituents carrying standard model hypercharge only. The required hyperchargeis modest, varying between about 1.3-1.6 for strong SU(N) coupling, to 2-3 forweak SU(N) coupling, for N=3, 4. This scenario predicts a variety of diphotonand multi-photon resonances, as well as photons from continuum pair production,and possibly exotic decays into standard model fermions, with no multi-jetresonances.

Diphoton Signals from Colorless Hidden Quarkonia