Hazma: a python toolkit for studying indirect detection of sub-GeV dark matter

Abstract

With several proposed MeV gamma-ray telescopes on the horizon, it is of paramount importance to perform accurate calculations of gamma-ray spectra expected from sub-GeV dark matter annihilation and decay. We present hazma, a python package for reliably computing these spectra, determining the resulting constraints from existing gamma-ray data, and prospects for upcoming telescopes. For high-level analyses, hazma comes with several built-in dark matter models where the interactions between dark matter and hadrons have been determined in detail using chiral perturbation theory. Additionally, hazma provides tools for computing spectra from individual final states with arbitrary numbers of light leptons and mesons, and for analyzing custom dark matter models. hazma can also produce electron and positron spectra from dark matter annihilation, enabling precise derivation of constraints from the cosmic microwave background. arXiv:1907.11846v2 [hep-ph] 16 Sep 2019 42 C.2 User-Defined Models 43 D Multi-particle phase space integration: rambo 48 E Gamma-ray Spectra from many final state particles: gamma_ray 50 -1 -

Indirect searches for dark matter bound state formation and level transitions

“…(65) up to O(ε l ) corrections. The full result shown here also agrees with the calculation in [76]. From the full result, we can determine the kinematic limits on the photon energy.…”

“…As our analysis was well underway, a more careful treatment of the hadronic resonances was completed with implementation in Herwig[75], specifically for the case of light dark photons. As we are using Pythia to find the final state photon spectrum, we leave the incorporation of these details relevant for m V 2 GeV for future work (see also[76]). …”

Dark matter spectra from the electroweak to the Planck scale

“…If we calculated the decay of a scalar instead of a vector, we obtain the same result after expanding in the limit → 0[103].…”

Hadronic footprint of GeV-mass dark matter

“…• HAZMA [19] is a Python toolkit to produce energy spectra in the sub-GeV range. It is based on leading order chiral perturbation theory and is valid in the non-resonance region below m χ = 250 MeV.…”

“…A major technical problem with dark matter annihilation into hadrons is that its description is not available through PYTHIA once the dark matter masses drop below around 5 GeV. The only exception is the recent HAZMA [19] tool for dark matter masses below 250 MeV [20]. This leaves dark matter annihilation to the leading hadronic final states for masses between 250 MeV and 5 GeV essentially uncovered.…”