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Exploring the realm of Dark Matter research, Light DM, which has a mass inthe range of 1 MeV to 1 GeV, is a fascinating topic both theoretically andexperimentally. We assume that the light dark matter is composed of complexscalars and produced from semi-annihilation, which is close to the scale of theMeV Gamma-ray satellite, allowing us to explore the implications of thishypothesis. The experimental data we used to constrain the scenario is fromfive different sources: the COMPTEL, EGRET, INTEGRAL, Fermi Gamma-ray SpaceTelescope, and the e-ASTROGAM future reach. We use the analytical formula tomeasure the X-ray spectra allowing us to determine the annihilationcross-section bounds from $10^{-28}\mathrm{cm}^3/\mathrm{s}$ to$10^{-22}\mathrm{cm}^3/\mathrm{s}$ for different combinations of dark matterand mediator masses. We found that the MeV gamma-ray provides valuable insightinto the structure of the semi-annihilation dark matter, where EGRETcontributes to the stringent constraint to the semi-annihilation, and thee-ASTROGAM future reach could probe the whole parameter space of the model.

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