LHC constraints on Yukawa unification in SO(10)

Abstract

LHC constraints on the recently proposed SUSY SO(10) GUT model with top-bottom-tau Yukawa unification are investigated. In this model, various phenomenological constraints are in concord with the Yukawa unification thanks to the negative sign of \mu, D-term splitting in the soft scalar masses and non-universal gaugino masses generated by a non-zero F-term in a 24-dimensional representation of SU(5) \subset SO(10). After discussing the impact of the CP-odd Higgs boson mass bound on this model, we provide a detailed analysis of the recent direct SUSY searches performed by ATLAS and investigate the constraints on this SO(10) model. At 95% confidence level, the lower limit on the gluino mass is found to be 675 GeV. Assuming an integrated luminosity of 10 fb^{-1}, this bound may be extended to 1.1 TeV if the right-handed down squark is lighter than about 1 TeV.

Comments: 22 pages, 7 figures, comments and references added, some refinements to the text, version to be published