NLSP Gluino and NLSP Stop Scenarios from b-tau Yukawa Unification

TL;DR

This paper explores supersymmetric models predicting gluino and stop particles close in mass to the neutralino, with potential detection prospects at the LHC, and discusses their implications for dark matter and collider constraints.

Contribution

It identifies viable b-tau Yukawa unified SUSY scenarios with NLSP gluino or stop, and provides benchmark points for future LHC searches.

Findings

NLSP gluino and stop masses range from 400 GeV to 1 TeV.

Degenerate gluino and stop scenarios are possible and phenomenologically relevant.

NLSP gluino with mass ~1 TeV can satisfy collider and astrophysical constraints.

Abstract

We present a study of b-tau Yukawa unified supersymmetric SU(4)_c x SU(2)_L x SU(2)_R model (with mu > 0), which predicts the existence of gluino - neutralino and stop - neutralino coannihilation scenarios compatible with the desired relic LSP neutralino dark matter abundance and other collider constraints. The NLSP gluino or NLSP stop masses vary between 400 GeV to ~ 1 TeV. The NLSP gluinos will be accessible at the 14 TeV LHC, while we hope that the NSLP stop solutions will be probed in future LHC searches. We also identify regions of the parameter space in which the gluino and the lighter stop are closely degenerate in mass, interchangeably playing the role of NLSP and NNLSP. We also update a previous study of t-b-tau Yukawa unification and show that NLSP gluino of mass ~ 1 TeV, with a mass difference between the gluino and neutralino of less than 80 GeV, can be realized consistent with the current collider and astrophysical constraints. We present benchmark points for b-tau and t-b-tau Yukawa unification that can be accessible at the LHC.