Bremsstrahlung signatures of dark matter annihilation in the Sun

Abstract

The nonrelativistic annihilation of Majorana dark matter in the Sun to a pair of light fermions is chirality-suppressed. Annihilation to 3-body final states ${\ell }^{+}{f}^{-}V$, where $V=W,Z,\gamma$, and $\ell$ and $f$ are light fermions (that may be the same), becomes dominant since bremsstrahlung relaxes the chirality suppression. We evaluate the neutrino spectra at the source, including spin and helicity dependent effects, and assess the detectability of each significant bremsstrahlung channel at IceCube/DeepCore. We also show how to combine the sensitivities to the dark matter-nucleon scattering cross section in individual channels, since typically several channels contribute in models.

12 pages, 7 figures, 2 tables. Version to appear in PRD

References in corpus (7)

• Observation of electron-antineutrino disappearance at Daya Bay
• Calculation of atmospheric neutrino flux using the interaction model calibrated with atmospheric muon data
• On the Importance of Electroweak Corrections for Majorana Dark Matter Indirect Detection
• Electroweak Bremsstrahlung in Dark Matter Annihilation
• Generic dark matter signature for gamma-ray telescopes
• Fermion WIMPless Dark Matter at DeepCore and IceCube
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Cited by in corpus (2)

• Majorana Dark Matter with a Coloured Mediator: Collider vs Direct and Indirect Searches
• On the Role of Neutrinos Telescopes in the Search for Dark Matter Annihilations in the Sun