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Electroweak bremsstrahlung for wino-like Dark Matter annihilations

Ciafaloni, Paolo
Comelli, Denis
De Simone, Andrea
Urbano, Alfredo
Published in Journal of Cosmology and Astroparticle Physics. 2012, vol. 2012, no. 06, p. 016-016
Abstract If the Dark Matter is the neutral Majorana component of a multiplet which is charged under the electroweak interactions of the Standard Model, its main annihilation channel is into W+W−, while the annihilation into light fermions is helicity suppressed. As pointed out recently, the radiation of gauge bosons from the initial state of the annihilation lifts the suppression and opens up an s-wave contribution to the cross section. We perform the full tree-level calculation of Dark Matter annihilations, including electroweak bremsstrahlung, in the context of an explicit model corresponding to the supersymmetric wino. We find that the fermion channel can become as important as the di-boson one. This result has significant implications for the predictions of the fluxes of particles originating from Dark Matter annihilations.
Keywords Dark matter theoryCosmology of theories beyond the SM
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CIAFALONI, Paolo et al. Electroweak bremsstrahlung for wino-like Dark Matter annihilations. In: Journal of Cosmology and Astroparticle Physics, 2012, vol. 2012, n° 06, p. 016-016. https://archive-ouverte.unige.ch/unige:36503

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Deposited on : 2014-05-12

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