X-rays constraints on sub-GeV Dark Matter

Abstract

We present updated constraints on 'light' Dark Matter (DM) particles with masses between 1 MeV and 5 GeV. In this range, we can expect DM-produced $e^{\pm }$ pairs to up-scatter low-energy ambient photons in the Milky Way via the Inverse Compton process, and produce a flux of X-rays that can be probed by a range of space observatories. Using diffuse X-ray data from XMM-Newton, INTEGRAL, NuSTAR and Suzaku, we compute the strongest constraints to date on annihilating DM for 200 MeV $<m_{\mathrm{DM}}<$ 5 GeV and decaying DM for 100 MeV $<m_{\mathrm{DM}}<$ 5 GeV.

arXiv commentContribution to the 34th Rencontres de Blois on Particle Physics and Cosmology (Blois 2023), the XVIII International Conference on Topics in Astroparticle and Underground Physics (TAUP 2023) and TeV Particle Astrophysics (TeVPA) 2023

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