LHC constraints on NLSP gluino and dark matter neutralino in Yukawa unified models

The ATLAS experiment has recently presented its search results for final states containing jets and/or b-jet(s) and missing transverse momentum, corresponding to an integrated luminosity of 165 pb(-1). We employ this data to constrain a class of supersymmetric SU(4)(c) x SU(2)(L) x SU(2)(R) models with t - b - tau Yukawa unification, in which the gluino is the next to lightest supersymmetric particle (NLSP). The NLSP gluino is slightly (similar to 10-30%) heavier than the LSP dark matter neutralino, and it primarily decays into the latter and a quark-antiquark pair or gluon. We find that NLSP gluino masses below similar to 300 GeV are excluded by the ATLAS data. For LSP neutralino mass similar to 200-300 GeV and mu > 0, where mu is the coefficient of the MSSM Higgs bilinear term, the LHC constraints in some cases on the spin-dependent (spin-independent) neutralino-nucleon cross section are significantly more stringent than the expected bounds from IceCube DeepCore (Xenon 1T/SuperCDMS). For mu < 0, this also holds for the spin-dependent cross sections. (C) 2011 Elsevier B.V. All rights reserved.