Constrained Exceptional Supersymmetric Standard Model with a Higgs Near 125 GeV

TL;DR

This paper explores the parameter space of the constrained exceptional supersymmetric standard model (cE6SSM) to identify regions compatible with a 125 GeV Higgs, LHC search constraints, and dark matter relic abundance, highlighting the model's phenomenology.

Contribution

It provides a detailed analysis of the cE6SSM parameter space consistent with Higgs mass, collider constraints, and dark matter, including benchmark points illustrating these features.

Findings

A 125 GeV Higgs requires a sufficiently large Z' mass.

Lighter gluinos are within reach of current or upcoming LHC runs.

Dark matter relic abundance can be achieved with a bino-like LSP.

Abstract

We study the parameter space of the constrained exceptional supersymmetric standard model (cE6SSM) consistent with a Higgs signal near 125 GeV and the LHC searches for squarks, gluinos and Z'. The cE6SSM parameter space consistent with correct electroweak symmetry breaking, is represented by scans in the (m0, M1/2) plane for fixed Z' mass and tan beta, with squark, gluino and Higgs masses plotted as contours in this plane. We find that a 125 GeV Higgs mass only arises for a sufficiently large Z' mass, mostly above current limits, and for particular regions of squark and gluino masses corresponding to multi-TeV squark masses, but with lighter gluinos typically within reach of the LHC 8 TeV or forthcoming 14 TeV runs. Successful dark matter relic abundance may be achieved over all the parameter space, assuming a bino-like LSP with a nearby heavier inert Higgsino doublet and decoupled inert singlinos, resulting in conventional gluino decay signatures. A set of typical benchmark points with a Higgs near 125 GeV is provided which exemplifies these features.