Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-04-15
JCAP 1106:018,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages, 6 figures. Minor corrections to match version published in JCAP
Scientific paper
10.1088/1475-7516/2011/06/018
Recent analyses have shown that the inclusion of electroweak corrections can alter significantly the energy spectra of Standard Model particles originated from dark matter annihilations. We investigate the important situation where the radiation of electroweak gauge bosons has a substantial influence: a Majorana dark matter particle annihilating into two light fermions. This process is in p-wave and hence suppressed by the small value of the relative velocity of the annihilating particles. The inclusion of electroweak radiation eludes this suppression and opens up a potentially sizeable s-wave contribution to the annihilation cross section. We study this effect in detail and explore its impact on the fluxes of stable particles resulting from the dark matter annihilations, which are relevant for dark matter indirect searches. We also discuss the effective field theory approach, pointing out that the opening of the s-wave is missed at the level of dimension-six operators and only encoded by higher orders.
Ciafaloni Paolo
Cirelli Marco
Comelli Denis
Riotto Antonio
Simone Andrea de
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