A heavier gluino from t–b–τ Yukawa-unified SUSY

Abstract

Supersymmetric models with t–b–τ Yukawa coupling unification and unified gaugino masses at the GUT scale—with μ>0—show a mild preference for light gluino masses mg˜≲500 GeV. This range of mg˜ is now essentially ruled out by LHC searches. We show that a heavier gluino with mg˜∼0.5–3 TeV can also be compatible with excellent t–b–τ Yukawa coupling unification in supersymmetric models with non-universal Higgs masses (NUHM2). The gluino in such models is the lightest colored sparticle, while the squark sector displays an inverted mass hierarchy with mq˜∼5–20 TeV. We present some LHC testable benchmark points for which the lightest Higgs boson mass mh≃125 GeV. We also discuss LHC signatures of Yukawa-unified models with heavier gluinos. We expect gluino pair production followed by decay to final states containing four b-jets plus four W-bosons plus missing ET to occur at possibly observable rates at LHC.