期刊
PHYSICS LETTERS B
卷 671, 期 3, 页码 391-397出版社
ELSEVIER
DOI: 10.1016/j.physletb.2008.12.012
关键词
-
资金
- NSERC, Canada
- Government of Canada through NSERC
- Province of Ontario through MEDT
We analyze the indirect astrophysical signatures of secluded models of WIMP dark matter, characterized by a weak-scale rate for annihilation into light MeV-scale mediators which are metastable to decay into Standard Model states. Such scenarios allow a significant enhancement of the annihilation cross section in the galactic halo relative to its value at freeze-out, particularly when the mediator is light enough for this process to proceed through radiative capture to a metastable 'WIMP-onium' bound state. For MeV-scale vector mediators charged under a hidden U(1)' gauge group, the enhanced annihilation rate leads predominantly to a sizable excess positron flux. even in the absence of astrophysical boost factors. (C) 2008 Elsevier B.V. All rights reserved.
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