Dark Matter at the Pseudoscalar Higgs Resonance in the pMSSM and SUSY GUTs

Abstract

We study dark matter at the MSSM pseudoscalar Higgs resonance (A-funnel), which is one of the few remaining MSSM thermal dark matter candidates in the $100-1000$ GeV range safe from direct detection constraints. To illustrate the various factors at play, this study is performed in two contrasting set-ups: a bottom-up phenomenological MSSM (pMSSM) approach that allows significant freedom, and the top-down, highly constrained Yukawa unified $SO(10)$ GUT model. In the pMSSM, for $\mu >0$, the entire parameter space lies above the coherent neutrino background and mostly within reach of XENON1T and LZ, while blind spots exist at $m_A>800$GeV for $\mu <0$; the strongest constraints come from $A/H\to \tau \tau$ searches at the LHC. For Yukawa unified models, the confluence of $B_s\to {\mu }^{+}{\mu }^{-}$ constraints, fits to the bottom quark and Higgs masses, and gluino mass bounds from the LHC result in a prediction: realizing the pseudoscalar resonance $requires$ gaugino mass non-universality, with a mass ratio that is determined to within a small range.

arXiv comment14 pages, 6 figures

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