Searching for inelastic dark matter with future LHC experiments

A bstract We consider a dark sector containing pair of almost degenerate states coupled to the Standard Model through photon mediator. This set-up constitutes simple realization inelastic matter scenario. The heaviest state is long-lived, in limit small kinetic mixing among and hypercharge gauge boson, and/or mass splitting states. study prospects for detection this scenario at proposed LHC experiments dedicated search long-lived particles, namely FASER, MATHUSLA, CODEX-b, AL3X, MAPP, ANUBIS FACET. both cases fermionic scalar matter. show that these experimental facilities can probe unexplored regions parameter space model, we highlight their complementary roles.