Revisiting LHC gluino mass bounds through radiative decays using MadAnalysis 5

TL;DR

This paper reevaluates gluino mass bounds at the LHC by analyzing radiative decay modes, providing improved limits especially for small mass differences, using existing ATLAS and CMS data with MadAnalysis 5.

Contribution

It demonstrates that existing LHC analyses can constrain radiative gluino decays, extending current mass bounds beyond three-body decay assumptions.

Findings

Radiative decay modes can be constrained with current data.

Improved gluino mass limits for small LSP-gluino mass differences.

Existing analyses are more versatile than previously thought.

Abstract

The ATLAS and CMS experiments at the CERN LHC have collected about 25 inverse femtobarns (fb) of data each at the end of their 8 TeV run, and ruled out a huge swath of parameter space in the context of Minimally Supersymmetric Standard Model (MSSM). Limits on masses of the gluino have been pushed to above 1 TeV. These limits are however extremely model dependent and do not always reflect the level of exclusion. So far the limits on the gluino mass using the simplified model approach only constrained its value using its three-body decays. We show in this work that already existing ATLAS and CMS analysis can also constrain the radiative gluino decay mode and we derived improved mass limits in particular when the mass difference between the LSP and the gluino is small.