Dark Matter and Higgs Mass in the CMSSM with Yukawa Quasi-Unification

Abstract

We present an updated analysis of the constrained minimal supersymmetric standard model with mu>0 supplemented by an `asymptotic' Yukawa coupling quasi-unification condition, which allows an acceptable b-quark mass. Imposing constraints from the cold dark matter abundance in the universe, B physics, the muon anomalous magnetic moment, and the mass m_h of the lightest neutral CP-even Higgs boson, we find that the lightest neutralino cannot act as a cold dark matter candidate. This is mainly because the upper bound on the lightest neutralino relic abundance from cold dark matter considerations, despite the fact that this abundance is drastically reduced by neutralino-stau coannihilations, is incompatible with the recent data on the branching ratio of B_s --> mu^+ mu^-. Allowing for a different particle, such as the axino or the gravitino, to be the lightest supersymmetric particle and, thus, constitute the cold dark matter in the universe, we find that the predicted m_h's in our model favor the range (119-126) GeV.

13 pages including 4 figures and 1 table, talk given by G. Lazarides at the 7th International Workshop on the Dark Side of the Universe, KITPC, Beijing, China, September 26-30, 2011 (to appear in the proceedings)

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• Phenomenology of the minimal supersymmetric $U(1{)}_{B-L}\times U(1{)}_R$ extension of the standard model
• Constrained SUSY seesaws with a 125 GeV Higgs
• Complete one-loop effects of SUSY QCD in $b\bar{b}h$ production at the LHC under current experimental constraints
• Quasi Yukawa Unification and Fine-Tuning in U(1) Extended SSM
• Inflation, Leptogenesis, and Yukawa Quasi-Unification within a Supersymmetric Left-Right Model
• Effects of Neutrino Inverse Seesaw Mechanism on the Sparticle Spectrum in CMSSM and NUHM2
• Constrained Minimal Supersymmetric Standard Model with Generalized Yukawa Quasi-Unification
• Probing the hyperbolic branch/focus point region of the constrained minimal supersymmetric standard model with generalized Yukawa quasi-unification