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Title: Vector dark matter annihilation with internal bremsstrahlung

We consider scenarios in which the annihilation of self-conjugate spin-1 dark matter to a Standard Model fermion-antifermion final state is chirality suppressed, but where this suppression can be lifted by the emission of an additional photon via internal bremsstrahlung. We find that this scenario can only arise if the initial dark matter state is polarized, which can occur in the context of self-interacting dark matter. In particular, this is possible if the dark matter pair forms a bound state that decays to its ground state before the constituents annihilate. We show that the shape of the resulting photon spectrum is the same as for self-conjugate spin-0 and spin-1/2 dark matter, but the normalization is less heavily suppressed in the limit of heavy mediators.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Physical Research Lab., Ahmedabad (India)
  2. Univ. of Hawaii, Honolulu, HI (United States)
  3. Indian Inst. of Technology (IIT), Kanpur (India)
Publication Date:
Grant/Contract Number:
SC0010504
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 766; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS
OSTI Identifier:
1343157
Alternate Identifier(s):
OSTI ID: 1367083