2016/04/04 by Andre Scaffidi, Katherine Freese, Jinmian Li +4 · 3 citations
Physics and Astronomy · #Annihilation #Anomalous magnetic dipole moment #Astrophysics #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Fermi Gamma-ray Space Telescope #Muon #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Radiative transfer #Scalar field dark matter #astro-ph.HE #hep-ph
paper · pdf · doi:10.1103/physrevd.93.115024
published as Phys. Rev. D 93, 115024 (2016) · 11 pages, 7 figures + anc files
arxiv created 2016/04/04 · openalex publication_date 2016/06/17 · arxiv updated 2016/06/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Dark matter searches in gamma ray final states often make use of the fact that photons can be produced from final state muons. Modern Monte Carlo generators and dark matter codes include the effects of final state radiation from muons produced in the dark matter annihilation process itself, but neglect the O(1%) radiative correction that arises from the subsequent muon decay. After implementing this correction we demonstrate the effect that it can have on dark matter phenomenology by considering the case of dark matter annihilation to four muons via scalar mediator production. We first show that the AMS-02 positron excess can no longer easily be made consistent with this final state once the Fermi-LAT dwarf limits are calculated with the inclusion of radiative muon decays, and we next show that the Fermi-LAT galactic center gamma excess can be improved with this final state after inclusion of the same effect. We provide code and tables for the implementation of this effect in the popular dark matter code micrOMEGAs, providing a solution for any model producing final state muons.