E6SSM vs MSSM gluino phenomenology

TL;DR

The paper compares the phenomenology of gluinos in the E6SSM and MSSM models, highlighting differences in decay chains and collider signatures, which impact current SUSY search strategies.

Contribution

It provides a detailed analysis of gluino decay chains in the E6SSM, showing they are longer and produce different collider signatures than in the MSSM.

Findings

Gluino decay chains in E6SSM are about 2 steps longer than in MSSM.

E6SSM predicts less missing transverse momentum in collider events.

Current SUSY search strategies may need revision based on these differences.

Abstract

The E6SSM is a promising model based on the group E6, assumed to be broken at the GUT scale, leading to the group SU(3)\times SU(2)\times U(1)\times U(1)' at the TeV scale. It gives a solution to the MSSM {\mu}-problem without introducing massless axions, gauge anomalies or cosmological domain walls. The model contains three families of complete 27s of E6, giving a richer phenomenology than the MSSM. The E6SSM generically predicts gluino cascade decay chains which are about 2 steps longer than the MSSM's due to the presence of several light neutralino states. This implies less missing (and more visible) transverse momentum in collider experiments and kinematical distributions such as M_eff are different. Scans of parameter space and MC analysis suggest that current SUSY search strategies and exclusion limits have to be reconsidered.