Built on

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E. J. Chun, J. C. Park and S. Scopel, “Non-perturbative Effect and PAMELA Limit on Electro-Weak Dark Matter,” JCAP 1212
Original
2012
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K. N. Abazajian and J. P. Harding, “Constraints on WIMP and Sommerfeld-Enhanced Dark Matter Annihilation from HESS Observations of the Galactic Center,” JCAP 1201
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2012
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2012
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J. Fan and M. Reece, “In Wino Veritas? Indirect Searches Shed Light on Neutralino Dark Matter,” JHEP 1310
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2015
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M. Badziak, A. Delgado, M. Olechowski, S. Pokorski and K. Sakurai, “Detecting underabundant neutralinos,” JHEP 1511
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E. J. Chun and J. C. Park, “Electro-Weak Dark Matter: non-perturbative effect confronting indirect detections,” Phys. Lett. B 750
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2016

Very Degenerate Higgsino Dark Matter

Chun, Eung Jin, Jung, Sunghoon, Park, Jong-Chul

Understand

We present a study of the Very Degenerate Higgsino Dark Matter (DM), whose mass splitting between the lightest neutral and charged components is ${\cal O}$(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 $v/c \lesssim 10^{-3}$.