Robust constraints on feebly interacting particles using XMM-Newton
Pedro De la Torre Luque (The Oskar Klein Centre, Department of Physics, Stockholm University, Stockholm 106 91, Sweden); Shyam Balaji (Laboratoire de Physique Théorique et Hautes Energies (LPTHE), UMR 7589 CNRS and Sorbonne Université, 4 Place Jussieu, F-75252, Paris, France, Institut d’Astrophysique de Paris, UMR 7095 CNRS and Sorbonne Université, 98 bis boulevard Arago, F-75014 Paris, France); Pierluca Carenza (The Oskar Klein Centre, Department of Physics, Stockholm University, Stockholm 106 91, Sweden)
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.
