skip to main content

DOE PAGESDOE PAGES

Title: Very Degenerate Higgsino Dark Matter

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.
Authors:
 [1] ;  [2] ;  [3]
  1. Korea Inst. for Advanced Study, Seoul (Korea, Republic of)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States); Kavli Inst. for Theoretical Physics, Santa Barbara, CA (United States)
  3. Chungnam National Univ., Daejeon (Korea, Republic of). Dept. of Physics
Publication Date:
Report Number(s):
SLAC-PUB-16697
Journal ID: ISSN 1029-8479; PII: 5298
Grant/Contract Number:
AC02-76SF00515; PHY11-25915; NRF-2013R1A1A2061561; 2016R1C1B2015225
Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 1; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Research Org:
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 Org:
USDOE; National Science Foundation (NSF); National Research Foundation (NRF) of Korea (Korea, Republic of)
Contributing Orgs:
Kavli Inst. for Theoretical Physics, Santa Barbara, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Supersymmetry Phenomenology
OSTI Identifier:
1353095