Cold Dark Matters in U(1)' Models

Abstract

We consider models with extra U(1)' gauge symmetry that is broken spontaneously. In the models, there are cold dark matter candidates which are charged under U(1)' symmetry. Depending on the charge assignment, we can evade the strong bound from the Drell-Yang process, and consider the scenario that the dark matters strongly interact with the fermions in the Standard Model through the extra gauge boson exchanging. As an illustrative example, we discuss a supersymmetric gauged U(1)_B \times U(1)_L model and see that not only correct relic density but also the DAMA/CoGeNT excess can be achieved by the dark matters.