LHC Constraints on NLSP Gluino and Dark Matter Neutralino in Yukawa Unified Models

Understand

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 (~10-30%) heavier than the 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 ~300 GeV are excluded by the ATLAS data.