Hidden sector dark matter and Higgs physics

Understand

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 $H_1$ and $H_2$.
• 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 $H_1$ and $H_2$ contributions to the direct detection cross section of the DM.