Very Degenerate Higgsino Dark Matter

Abstract

We present a study of the Very Degenerate Higgsino Dark Matter (DM), whose mass splitting between the lightest neutral and charged components is $\mathcal{O}$(1) MeV, much smaller than radiative splitting of 355 MeV. The scenario is realized in the minimal supersymmetric standard model by small gaugino mixing. In contrast to the pure Higgsino DM with the radiative splitting only, various observable signatures with distinct features are induced. First of all, the very small mass splitting makes (a) sizable Sommerfeld enhancement and Ramsauer-Townsend (RT) suppression relevant to ~1 TeV Higgsino DM, and (b) Sommerfeld-Ramsauer-Townsend effect saturate at lower velocities $v/c\lesssim 10^{-3}$. As a result, annihilation signals can be large enough to be observed from the galactic center and/or dwarf galaxies, while relative signal sizes can vary depending on the location of Sommerfeld peaks and RT dips. In addition, at collider experiments, stable chargino signature can be searched for to probe the model in the future. DM direct detection signal, however, depends on the Wino mass; even no detectable signal can be induced if the Wino is heavier than about 10 TeV.

19 pages, 4 figures

References in corpus (16)

• Cosmology and Astrophysics of Minimal Dark Matter
• The Well-Tempered Neutralino
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
• Particle physics catalysis of thermal Big Bang Nucleosynthesis
• Neutralino Dark Matter at 14 and 100 TeV
• Higgsino Dark Matter in High-Scale Supersymmetry
• Resonant Dark Matter
• Supersymmetry with a Chargino NLSP and Gravitino LSP
• Prospects for Annihilating Dark Matter in the inner Galactic halo by the Cherenkov Telescope Array
• Indirect Dark Matter Detection Limits from the Ultra-Faint Milky Way Satellite Segue 1
• Prospects for Electroweakino Discovery at a 100 TeV Hadron Collider
• Resonant scattering and recombination of pseudo-degenerate WIMPs
• Prospects for observing charginos and neutralinos at a 100 TeV proton-proton collider
• Direct constraints on charged excitations of dark matter
• Resolving the existence of Higgsinos in the LHC inverse problem

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