MeV Gamma-Ray Constraints for Light Dark Matter from Semi-Annihilation

Abstract

Exploring the realm of Dark Matter research, Light DM, which has a mass in the range of 1 MeV to 1 GeV, is a fascinating topic both theoretically and experimentally. We assume that the light dark matter is composed of complex scalars and produced from semi-annihilation, which is close to the scale of the MeV Gamma-ray satellite, allowing us to explore the implications of this hypothesis. The experimental data we used to constrain the scenario is from five different sources: the COMPTEL, EGRET, INTEGRAL, Fermi Gamma-ray Space Telescope, and the e-ASTROGAM future reach. We use the analytical formula to measure the X-ray spectra allowing us to determine the annihilation cross-section bounds from $10^{-28}{\mathrm{cm}}^3/\mathrm{s}$ to $10^{-22}{\mathrm{cm}}^3/\mathrm{s}$ for different combinations of dark matter and mediator masses. We found that the MeV gamma-ray provides valuable insight into the structure of the semi-annihilation dark matter, where EGRET contributes to the stringent constraint to the semi-annihilation, and the e-ASTROGAM future reach could probe the whole parameter space of the model.

arXiv comment8 pages, 5 figures, comments are welcome

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• Simultaneous detection of boosted dark matter and neutrinos from the semi-annihilation at DUNE
• Asymmetric dark matter from semi-annihilation: unitarity constraints and long-lived final states
• Contributions to $Z^0$ decays from a X17 extension of the Standard Model