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Title: Dark matter annihilation with s-channel internal Higgsstrahlung

We study the scenario of fermionic dark matter that annihilates to standard model fermions through an s-channel axial vector mediator. We point out that the well-known chirality suppression of the annihilation cross section can be alleviated by s-channel internal Higgsstrahlung. The shapes of the cosmic ray spectra are identical to that of t-channel internal Higgsstrahlung in the limit of a heavy mediating particle. Unlike the general case of t-channel bremsstrahlung, s-channel Higgsstrahlung can be the dominant annihilation process even for Dirac dark matter. Finally, since the s-channel mediator can be a standard model singlet, collider searches for the mediator are easily circumvented.
Authors:
 [1] ; ORCiD logo [1] ;  [1]
  1. Univ. of Hawaii, Honolulu, HI (United States). Dept. of Physics and Astronomy
Publication Date:
Grant/Contract Number:
SC0010504; PHY-1250573
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 759; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1254869
Alternate Identifier(s):
OSTI ID: 1360089