Indirect Detection of Sub-GeV Dark Matter Coupling to Quarks

Abstract

We consider photon signals arising from the annihilation or decay of low-mass (sub-GeV) dark matter which couples dominantly to quarks. In this scenario, the branching fractions to the various kinematically accessible hadronic final states can largely be determined from chiral perturbation theory. Several of these final states yield striking spectral features in the sub-GeV photon spectrum. New experiments, such as e-ASTROGAM and AMEGO, are in development to improve sensitivity in this energy range, and we discuss their potential sensitivity to this class of models.

12 pages, 3 figures, LaTeX. Minor errors fixed, results unchanged. Matches journal version

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• Heating neutron stars with GeV dark matter
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