Very Degenerate Higgsino Dark Matter

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

doi:10.1007/JHEP01(2017)009

Title: Very Degenerate Higgsino Dark Matter

Journal Article · Tue Jan 03 00:00:00 EST 2017 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP01(2017)009· OSTI ID:1353095

Chun, Eung Jin ^[1]; Jung, Sunghoon ^[2]; Park, Jong-Chul ^[3]

Korea Inst. for Advanced Study, Seoul (Korea, Republic of)
SLAC National Accelerator Lab., Menlo Park, CA (United States); Kavli Inst. for Theoretical Physics, Santa Barbara, CA (United States)
Chungnam National Univ., Daejeon (Korea, Republic of). Dept. of Physics

In this paper, we present a study of the Very Degenerate Higgsino Dark Matter (DM), whose mass splitting between the lightest neutral and charged components is O(1) MeV, much smaller than radiative splitting of 355 MeV. The scenario is realized in the minimal supersymmetric standard model by small gaugino mixings. 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 ≲ 10^-3. As a result, annihilation signals can be large enough to be observed from the galactic center and/or dwarf galaxies, while the relative signal sizes can vary depending on the locations of Sommerfeld peaks and RT dips. In addition, at collider experiments, stable chargino signatures can be searched for to probe the model in the future. Finally, DM direct detection signals, however, depend on the Wino mass; even no detectable signals can be induced if the Wino is heavier than about 10 TeV.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States); Korea Inst. for Advanced Study, Seoul (Korea, Republic of); Chungnam National Univ., Daejeon (Korea, Republic of)

Sponsoring Organization:: USDOE; National Science Foundation (NSF); National Research Foundation (NRF) of Korea (Korea, Republic of)

Contributing Organization:: Kavli Inst. for Theoretical Physics, Santa Barbara, CA (United States)

Grant/Contract Number:: AC02-76SF00515; PHY11-25915; NRF-2013R1A1A2061561; 2016R1C1B2015225

OSTI ID:: 1353095

Report Number(s):: SLAC-PUB-16697; PII: 5298

Journal Information:: Journal of High Energy Physics (Online), Vol. 2017, Issue 1; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 11 works

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