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Title: Indirect signals from solar dark matter annihilation to long-lived right-handed neutrinos

In this paper, we study indirect detection signals from solar annihilation of dark matter (DM) particles into light right-handed (RH) neutrinos with a mass in a 1–5 GeV range. These RH neutrinos can have a sufficiently long lifetime to allow them to decay outside the Sun, and their delayed decays can result in a signal in gamma rays from the otherwise “dark” solar direction, and also a neutrino signal that is not suppressed by the interactions with solar medium. We find that the latest Fermi-LAT and IceCube results place limits on the gamma ray and neutrino signals, respectively. Combined photon and neutrino bounds can constrain the spin-independent DM-nucleon elastic scattering cross section better than direct detection experiments for DM masses from 200 GeV up to several TeV. Finally, the bounds on spin-dependent scattering are also much tighter than the strongest limits from direct detection experiments.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Univ. of New Mexico, Albuquerque, NM (United States). Dept. of Physics and Astronomy
  2. Texas A & M Univ., College Station, TX (United States). Dept. of Physics and Astronomy. Mitchell Inst. for Fundamental Physics and Astronomy; Wayne State Univ., Detroit, MI (United States). Dept. of Physics and Astronomy
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-16-29252
Journal ID: ISSN 2470-0010
Grant/Contract Number:
AC52-06NA25396; PHY-1417510
Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 95; Journal Issue: 7; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)
Contributing Orgs:
Texas A & M Univ., College Station, TX (United States); Wayne State Univ., Detroit, MI (United States)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1357126
Alternate Identifier(s):
OSTI ID: 1349772