Indirect Detection of Sub-GeV Dark Matter Coupling to Quarks

Understand

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.