Neutrino signals from electroweak bremsstrahlung in solar WIMP annihilation
Nicole F Bell, Amelia J Brennan, Thomas D Jacques
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | IOP PUBLISHING LTD | Published : 2012
Bremsstrahlung of W and Z gauge bosons, or photons, can be an important dark matter annihilation channel. In many popular models in which the annihilation to a pair of light fermions is helicity suppressed, these bremsstrahlung processes can lift the suppression and thus become the dominant annihilation channels. The resulting dark matter annihilation products contain a large, energetic, neutrino component. We consider solar WIMP annihilation in the case where electroweak bremsstrahlung dominates, and calculate the resulting neutrino spectra. The flux consists of primary neutrinos produced in processes such as χχ ν̄νZ and χχ → ν ̄ ℓW, and secondary neutrinos produced via the decays of gauge ..View full abstract
AJB was supported by the Commonwealth of Australia and NFB by the Australian Research Council. We thank Thomas Weiler, Kalliopi Petraki, James Dent, Lawrence Krauss, Nicholas Setzer and Martin White for helpful discussions.