Inelastic Dirac dark matter

A bstract Feebly interacting thermal relics are promising dark matter candidates. Among them, scenarios of inelastic Dark Matter evade direct detection by suppressed elastic scattering off atomic nuclei. We introduce Dirac , a new model with two fermions in the MeV-GeV mass range. At feeble couplings, can depart from chemical as well kinetic equilibrium Standard Model before freeze-out. In this case, freeze-out is driven conversion processes like coscattering, rather than coannihilation. show that consistent cosmological observations, particular nucleosynthesis and cosmic microwave background. Searches for sectors at colliders fixed-target experiments, turn, very sensitive probes. Compared to strongly constrained pseudo-Dirac scenario, offers search target existing upcoming experiments Belle II, ICARUS, LDMX SeaQuest.