Dark matter annihilation into right-handed neutrinos and the galactic center gamma-ray excess

Understand

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.