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[ascl:2212.009] Hazma: Compute indirect detection constraints on sub-GeV dark matter

Hazma enables indirect detection of sub-GeV dark matter. It computes gamma-ray and electron/positron spectra from dark matter annihilations, sets limits on sub-GeV dark matter using existing gamma-ray data, and determines the discovery reach of future gamma-ray detectors. The code also derives accurate CMB constraints. Hazma comes with several sub-GeV dark matter models, for which it provides functions to compute dark matter annihilation cross sections and mediator decay widths. A variety of low-level tools are provided to make it straightforward to define new models.