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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 thevarious factors at play, this study is performed in two contrasting set-ups: abottom-up phenomenological MSSM (pMSSM) approach that allows significantfreedom, and the top-down, highly constrained Yukawa unified $SO(10)$ GUTmodel. In the pMSSM, for $\mu > 0$, the entire parameter space lies above thecoherent neutrino background and mostly within reach of XENON1T and LZ, whileblind spots exist at $m_A\,> \, 800\,$GeV for $\mu < 0$; the strongestconstraints come from $A/H \rightarrow \tau \tau$ searches at the LHC. ForYukawa unified models, the confluence of $B_s \rightarrow \mu^+ \mu^-$constraints, fits to the bottom quark and Higgs masses, and gluino mass boundsfrom the LHC result in a prediction: realizing the pseudoscalar resonance$requires$ gaugino mass non-universality, with a mass ratio that is determinedto within a small range.

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