During galactic Supernova (SN) explosions, a large amount of feebly interacting particles (FIPs) may be produced. In this work we analyze electrophilic FIPs with masses in the MeV-range that escape from SN and decay into electron-positron pairs, causing an exotic leptonic injection. This contribution adds up to known components, leading to an unexpected excess of X-ray fluxes generated by inverse-Compton scattering of the injected particles on low-energy photon backgrounds. For the first time in the context of FIPs, we use XMM-Newton X-ray measurements to obtain the strongest and most robust bounds on electrophilic FIPs produced by SN in our Galaxy.
Cite
@article{arxiv.2307.13728,
title = {Robust constraints on feebly interacting particles using XMM-Newton},
author = {Pedro De la Torre Luque and Shyam Balaji and Pierluca Carenza},
journal= {arXiv preprint arXiv:2307.13728},
year = {2024}
}