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arXiv · 1612.03110

Indirect Signals from Solar Dark Matter Annihilation to Long-lived Right-handed Neutrinos

Rouzbeh Allahverdi·Yu Gao·Bradley Knockel·Shashank Shalgar
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Abstract

We study indirect detection signals from solar annihilation of dark matter (DM) particles into light right-handed (RH) neutrinos with a mass in a $1-5$ GeV range. These RH neutrinos can have a sufficiently long lifetime to allow them to decay outside the Sun and their delayed decays can result in a signal in gamma rays from the otherwise `dark' solar direction, and also a neutrino signal that is not suppressed by the interactions with solar medium. We find that the latest Fermi-LAT and IceCube results place limits on the gamma ray and neutrino signals, respectively. Combined photon and neutrino bounds can constrain the spin-independent DM-nucleon elastic scattering cross section better than direct detection experiments for DM masses from 200 GeV up to several TeV. The bounds on spin-dependent scattering are also much tighter than the strongest limits from direct detection experiments.

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Rouzbeh Allahverdi, Yu Gao, Bradley Knockel, Shashank Shalgar. 2016-12-09. Indirect Signals from Solar Dark Matter Annihilation to Long-lived Right-handed Neutrinos. https://doi.org/10.1103/physrevd.95.075001

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