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With several proposed MeV gamma-ray telescopes on the horizon, it is ofparamount importance to perform accurate calculations of gamma-ray spectraexpected from sub-GeV dark matter annihilation and decay. We present hazma, apython package for reliably computing these spectra, determining the resultingconstraints from existing gamma-ray data, and prospects for upcomingtelescopes. For high-level analyses, hazma comes with several built-in darkmatter models where the interactions between dark matter and hadrons have beendetermined in detail using chiral perturbation theory. Additionally, hazmaprovides tools for computing spectra from individual final states witharbitrary numbers of light leptons and mesons, and for analyzing custom darkmatter models. hazma can also produce electron and positron spectra from darkmatter annihilation, enabling precise derivation of constraints from the cosmicmicrowave background.

Hazma: A Python Toolkit for Studying Indirect Detection of Sub-GeV Dark Matter