Abstract.
Dark matter particles can be accelerated by annihilation processes such as semi-annihilations and n -> m (n > m) processes when the dark sector is non-minimally extended. Such boosted dark matter can provide a distinctive signature of a non-minimal dark sector, and its experimental detectability has been explored in a model-independent manner in previous work. In this work, we construct an explicit model of boosted dark matter originating from semi-annihilations. A Dirac fermion is identified as the dark matter candidate, which semi-annihilates into a pair of an anti-dark matter particle and a neutrino. The small neutrino masses are also radiatively generated at the two-loop level. Taking into account the relevant experimental and theoretical constraints, we find that the mass of the mediator needs to be O(1), MeV for elastic scattering with nucleons, so that the cross section is enhanced to O(10^{-36}) cm^2 , allowing detection in future experiments such as DUNE and DARWIN.
(The slides will be available here)