Electroweak bremsstrahlung for wino-like Dark Matter annihilations
- Dipartimento di Fisica, Università di Lecce and INFN — Sezione di Lecce, via per Arnesano, I-73100 Lecce (Italy)
- INFN — Sezione di Ferrara, via Saragat 3, I-44100 Ferrara (Italy)
- SISSA, via Bonomea 265, I-34136 Trieste (Italy)
- Département de Physique Théorique and Centre for Astroparticle Physics (CAP), 24 quai E. Ansermet, CH-1211 Genève (Switzerland)
- Laboratoire de Physique Théorique de l'École Normale Supérieure, 24 rue Lhomond, F-75231 Paris (France)
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{sup +}W{sup −}, 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.
- OSTI ID:
- 22279802
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2012, Issue 06; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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