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Dark matter annihilation into right-handed neutrinos and the galactic center gamma-ray excess (1512.02899v3)
Published 9 Dec 2015 in hep-ph
Abstract: In this paper, we will discuss a specific case that the dark matter particles annihilate into right-handed neutrinos. We calculate the predicted gamma-ray excess from the galactic center and compare our results with the data from the Fermi-LAT. An approximately 10-60 GeV right-handed neutrino with heavier dark matter particle can perfectly explain the observed spectrum. The annihilation cross section $\langle \sigma v \rangle$ falls within the range $0.5$-$4 \times 10{-26} \text{ cm}3/\text{s}$, which is roughly compatible with the WIMP annihilation cross section.
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