E₆SSM vs MSSM gluino phenomenology

University of Southampton

^a Presenter of the project at HCP-2011
^b P.Svantesson@soton.ac.uk

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)×SU(2)×U(1)×U(1)′ at the TeV scale. It gives a solution to the MSSM μ-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.