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

TL;DR

This paper analyzes the CMSSM with Yukawa quasi-unification, showing the neutralino cannot be dark matter under current constraints, but predicts Higgs masses in the 119-126 GeV range if other particles are dark matter candidates.

Contribution

It provides an updated analysis of the CMSSM with Yukawa quasi-unification, exploring dark matter candidates and Higgs mass predictions under various experimental constraints.

Findings

Neutralino cannot be dark matter candidate due to B_s --> mu^+ mu^- constraints.

Predicted Higgs mass range is 119-126 GeV.

Alternative dark matter candidates like axino or gravitino are favored.

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.