750 GeV diphoton excess explained by a resonant sneutrino in R-parity violating supersymmetry

Abstract

We explain the recent excess seen by ATLAS and CMS experiments at around 750 GeV in the diphoton invariant mass as a narrow-width sneutrino decaying to diphotons via a stau loop in R-parity violating supersymmetry. The stau mass is predicted to be somewhere between half the resonant sneutrino mass and half the sneutrino mass plus 14 GeV. The scenario also predicts further signal channels at an invariant mass of 750 GeV, the most promising being into dijets and WW. We also predict a left-handed charged slepton decaying into WZ and Wγ at a mass 750–754 GeV.