Hazma Meets HERWIG4DM: Precision Gamma-Ray, Neutrino, and Positron Spectra for Light Dark Matter

Abstract

We present a new open-source package, Hazma 2, that computes accurate spectra relevant for indirect dark matter searches for photon, neutrino, and positron production from vector-mediated dark matter annihilation and for spin-one dark matter decay. The tool bridges across the regimes of validity of two state of the art codes: Hazma 1, which provides an accurate description below hadronic resonances up to center-of-mass energies around 250 MeV, and HERWIG4DM, which is based on vector meson dominance and measured form factors, and accurate well into the few GeV range. The applicability of the combined code extends to approximately 1.5 GeV, above which the number of final state hadrons off of which we individually compute the photon, neutrino, and positron yield grows exceedingly rapidly. We provide example branching ratios, particle spectra and conservative observational constraints from existing gamma-ray data for the well-motivated cases of decaying dark photon dark matter and vector-mediated fermionic dark matter annihilation. Finally, we compare our results to other existing codes at the boundaries of their respective ranges of applicability. Hazma 2 is freely available on GitHub.

25 pages, 9 figures, typos fixed, added explanation about vector couplings, version published in JCAP

References in corpus (12)

• Multi-Step Cascade Annihilations of Dark Matter and the Galactic Center Excess
• Introduction to Chiral Perturbation Theory
• Narrow resonances studies with the radiative return method
• PANGU: A High Resolution Gamma-ray Space Telescope
• Four-pion production in tau decays and e+e- annihilation: an update
• Modeling interactions of photons with pseudoscalar and vector mesons
• Massive Argon Space Telescope (MAST): a concept of heavy time projection chamber for gamma-ray astronomy in the 100 MeV --- 1 TeV energy range
• Precision Gamma-Ray Constraints for Sub-GeV Dark Matter Models
• Hunting for Dark Matter and New Physics with GECCO
• A Robust Description of Hadronic Decays in Light Vector Mediator Models
• Cosmology and prospects for sub-MeV dark matter in electron recoil experiments
• Indirect Detection of Low-mass Dark Matter Through the ${\pi }^0$ and $\eta$ Windows

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• Putting all the X in one basket: Updated X-ray constraints on sub-GeV Dark Matter
• INTEGRAL, eROSITA and Voyager Constraints on Light Bosonic Dark Matter: ALPs, Dark Photons, Scalars, $B-L$ and $L_i-L_j$ Vectors
• Constraining light dark matter in vector-scalar portals with COSI and AMEGO-X