Hidden sector dark matter and Higgs physics

Abstract

We consider a hidden sector dark matter, where a singlet fermion is a cold dark matter and a real singlet scalar boson S is a messenger between the SM and the hidden sectors. This singlet scalar will mix with the SM Higgs boson h, and we expect there are two Higgs-like scalar bosons H1 and H2. Imposing all the relevant constraints from collider search bounds on Higgs boson, DM scattering cross section on proton and thermal relic density. We find that there is a destructive interference between H1 and H2 contributions to the direct detection cross section of the DM. Also one of the two Higgs-like scalar bosons can easily escape the detections at the LHC, and there will be a universal reduction of the signal strength for the observed 125 GeV Higgs-like boson, which could be tested at the LHC with more data in the future.