期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2013/12/024
关键词
dark matter theory; cosmology of theories beyond the SM
资金
- London Centre for Terauniverse Studies (LCTS)
- European Research Council [267352]
- KCL Graduate Teaching Assistantship
- European Research Council (ERC) [267352] Funding Source: European Research Council (ERC)
For Majorana dark matter, gauge boson bremsstrahlung plays an important role in enhancing an otherwise helicity-suppressed s-wave annihilation cross-section. This is well known for processes involving a radiated photon or gluon together with a Standard Model fermion-antifermion pair, and the case of massive electroweak gauge bosons has also recently been studied. Here we show that internal Higgs bremsstrahlung also lifts helicity suppression and could be the dominant contribution to the annihilation rate in the late Universe for dark matter masses below similar to 1 TeV. Using a toy model of leptophilic dark matter, we calculate the annihilation cross-section into a lepton-antilepton pair with a Higgs boson and investigate the energy spectra of the final stable particles at the annihilation point.
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