A SUSY Inspired Simplified Model for the 750 GeV Diphoton Excess

Understand

The evidence for a new singlet scalar particle from the 750 GeV diphoton excess, and the absence of any other signal of new physics at the LHC so far, suggest the existence of new coloured scalars.

• To study this possibility, we propose a supersymmetry inspired simplified model, extending the Standard Model with a singlet scalar and with heavy scalar fields carrying both colour and electric charges -- the `squarks'.
• To allow the latter to decay, and to generate the dark matter of the Universe, we also add a neutral fermion to the particle content.
• We show that this model provides a two-parameter fit to the observed diphoton excess consistently with cosmology, while the allowed parameter space is bounded by the consistency of the model.