Searching for Gluino LSP at the LHC

TL;DR

This paper investigates the detection prospects of a gluino as the lightest supersymmetric particle at the LHC within the $ u$SSM, analyzing production, decay channels, and current experimental constraints.

Contribution

It provides the first detailed analysis of gluino LSP signals in the $ u$SSM, including decay modes, parameter space constraints, and comparison with LHC search results.

Findings

Gluino LSP mass lower limit of about 2600 GeV.

Decay length upper limit of approximately 6 cm.

Compatibility with neutrino, Higgs, and flavor data constraints.

Abstract

We analyse relevant signals expected at the LHC, assuming that the gluino is the lightest supersymmetric particle (LSP) in the framework of the $\mu\nu$SSM. In this $R$-parity violating model, the presence of couplings involving right-handed neutrinos solves simultaneously the $\mu$ problem and the accommodations of neutrino masses and mixing angles. We study gluino pair production in quark-antiquark and gluon-gluon collisions. The main decay channels for the gluino LSP are the three-body decays to two quarks and a lepton or a neutrino. In both cases, the leading channels occur for the third family of quarks. We compare the predictions of this scenario with LHC searches for prompt and long-lived particles. To analyse the parameter space we sample the $\mu\nu$SSM for a gluino LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Our results imply a lower limit on the mass of the gluino LSP of about 2600 GeV, and an upper limit for the decay length of about 6 cm.