Multi-lepton signatures at the LHC from sneutrino dark matter

Abstract

We investigate multi-lepton LHC signals arising from an extension at the grand unification scale of the standard minimal supersymmetric model (MSSM) involving right-handed neutrino superfields. In this framework neutrinos have Dirac masses and the mixed sneutrinos are the lightest supersymmetric particles and hence the dark matter candidates. We analyze the model parameter space in which the sneutrino is a good dark matter particle and has a direct detection cross-section compatible with the LUX bound. Studying the supersymmetric mass spectrum of this region, we find several multilepton signatures relevant for the LHC, which are distinct from the predictions of the MSSM with neutralino dark matter. We point out that if one of these signatures is detected, it might be an indication of sneutrino dark matter.