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 ℓ+f-V, where V=W, Z, γ, and ℓ 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.
- Publication:
-
Physical Review D
- Pub Date:
- October 2012
- DOI:
- 10.1103/PhysRevD.86.076014
- arXiv:
- arXiv:1208.1010
- Bibcode:
- 2012PhRvD..86g6014F
- Keywords:
-
- 95.35.+d;
- 95.85.Ry;
- Dark matter;
- Neutrino muon pion and other elementary particles;
- cosmic rays;
- High Energy Physics - Phenomenology;
- Astrophysics - High Energy Astrophysical Phenomena;
- High Energy Physics - Experiment
- E-Print:
- 12 pages, 7 figures, 2 tables. Version to appear in PRD