LHC Phenomenology of SO(10) Models with Yukawa Unification II

TL;DR

This paper investigates the phenomenology of Yukawa-unified SO(10) SUSY GUTs, analyzing gluino mass bounds from LHC data under different boundary conditions, and identifies viable models consistent with current experimental constraints.

Contribution

It provides a comprehensive analysis of gluino phenomenology in SO(10) models with Yukawa unification, incorporating recent LHC bounds and exploring different gaugino mass boundary conditions.

Findings

Lower bound on gluino mass is about 1.2 TeV at 1 sigma.

Many benchmark points remain viable under current LHC constraints.

Models with gluino-LSP degeneracy have weaker bounds.

Abstract

In this paper we study Yukawa-unified SO(10) SUSY GUTs with two types of SO(10) boundary conditions: (i) universal gaugino masses and (ii) non-universal gaugino masses with effective "mirage" mediation. With these boundary conditions, we perform a global chi^2 analysis to obtain the parameters consistent with 11 low energy observables, including the top, bottom, and tau masses. Both boundary conditions have universal scalar masses and "just so" splitting for the up- and down-type Higgs masses. In these models, the third family scalars are lighter than the first two families and the gauginos are lighter than all the scalars. We therefore focus on the gluino phenomenology in these models. In particular, we estimate the lowest allowed gluino mass in our models coming from the most recent LHC data and compare these to limits obtained using simplified models. We find that the lower bound on M_gluino in Yukawa-unified SO(10) SUSY GUTs is generically ~1.2 TEV at the 1 sigma level unless there is considerable degeneracy between the gluino and the LSP, in which case the bounds are much weaker. Hence many of our benchmark points are not ruled out by the present LHC data and are still viable models which can be tested at LHC 14.