Electroweak lights from Dark Matter annihilations

Abstract

The energy spectra of Standard Model particles originated from Dark Matter annihilations can be significantly altered by the inclusion of electroweak gauge boson radiation from the final state. A situation where this effect is particularly important is when a Majorana Dark Matter particle annihilates 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. I will discuss the impact of this effect on the fluxes of stable particles resulting from the Dark Matter annihilations, which are relevant for Dark Matter indirect searches.

4 pages, 2 figures. Contribution to the conference proceedings of TAUP 2011, Munich - Germany (5-9 September 2011)

References in corpus (5)

• Weak Corrections are Relevant for Dark Matter Indirect Detection
• New Gamma-Ray Contributions to Supersymmetric Dark Matter Annihilation
• On the Importance of Electroweak Corrections for Majorana Dark Matter Indirect Detection
• Antiproton constraints on dark matter annihilations from internal electroweak bremsstrahlung
• Initial State Radiation in Majorana Dark Matter Annihilations

Cited by in corpus (4)

• Simplified Models vs. Effective Field Theory Approaches in Dark Matter Searches
• On the effective operators for Dark Matter annihilations
• The Role of Electroweak Corrections for the Dark Matter Relic Abundance
• A conservative assessment of the current constraints on dark matter annihilation from Cosmic Rays and CMB observations