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We examine the observed diphoton excess at 750 GeV in the framework ofconstrained Minimal Supersymmetric Standard Model (cMSSM). The consistency ofcMSSM with the discovery of a 125 GeV Higgs boson and PLANCK/WMAP data for darkmatter relic density (RD) demands large mixing in the scalar top (stop) sectorand consequently, the existence of a light stop quasi-degenerate with thelightest neutralino. Small decay width due to kinematic and loop suppression ofsuch a stop allows for the existence of stop-antistop bound states (stoponia).Identifying the particular part of cMSSM parameter space consistent with Higgsboson mass as well as RD, we study stoponia as the source of the diphotonexcess.

The LHC Diphoton excess at 750 GeV in the framework of the Constrained Minimal Supersymmetric Standard Model