[sem. theorie ] Natural SUSY at LHC with Right-Sneutrino LSP

by Juhi Dutta (HRI Allahabad)

Wednesday 30 May 2018, 14:00 → 15:00 Europe/Paris

Salle 9

We study an extension of the minimal supersymmetric standard model (MSSM) with additional right-handed singlet neutrino superfields. While such an extension incorporates a mechanism for the neutrino mass, it also opens up the possibility of having the right-sneutrinos as the lightest supersymmetric particle (LSP). In this work, we focus on the viability of a rather small, <=500 GeV, higgsino mass parameter, an important ingredient for “naturalness”, in the presence of such a LSP. For simplicity, we assume that the bino and wino mass parameters are much heavier; thus we only consider (almost) pure and compressed higgsino-like states, with small O(10^−2 ) gaugino admixture. This nevertheless still affects the decay of the low-lying higgsino-like states thereby significantly affecting the proposed signatures at colliders. Considering prompt decays of the higgsino-like states, we discuss the importance of leptonic channels consisting of up to two leptons with large missing transverse energy to probe this scenario at the LHC. In addition we also comment on the dark matter predictions in such a scenario.