Dark matter in the finely tuned minimal supersymmetric standard model

Abstract

We explore dark matter in the finely-tuned minimal supersymmetric standard model (MSSM) recently proposed by Arkani-Hamed and Dimopoulos. Relative to the MSSM, there are fewer particles at freeze-out, so the calculation of the relic abundance simplifies. Similarly, the predictions for direct detection of the dark matter sharpen. There is a large region of mixed bino---higgsino dark matter where the lightest supersymmetric particle will be accessible at both the LHC and future direct detection experiments, allowing for a conclusive identification of the dark matter particle. Typical dark matter-nucleon cross sections are ${10}^{\ensuremath{-}45}\ensuremath{-}{10}^{\ensuremath{-}44}\text{ }\text{ }{\mathrm{c}\mathrm{m}}^{2}$. This model also possesses a novel region where the dark matter annihilates via an $s$-channel Higgs boson resonance.