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

TL;DR

This paper explores how dark matter annihilating into right-handed neutrinos could explain the gamma-ray excess observed in the galactic center, aligning theoretical predictions with Fermi-LAT data.

Contribution

It introduces a model where dark matter annihilates into right-handed neutrinos, providing a potential explanation for the gamma-ray excess with specific mass and cross section parameters.

Findings

Right-handed neutrino mass around 10-60 GeV explains the gamma-ray spectrum.

Annihilation cross section compatible with WIMP expectations.

Model fits observational data well.

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.