Search for Higgs portal DM at the ILC

Understand

Higgs portal dark matter (DM) models are simple interesting and viable DM models.

• There are three types of the models depending on the DM spin: scalar, fermion and vector DM models.
• In this paper, we consider renormalizable, unitary and gauge invariant Higgs portal DM models, and study how large parameter regions can be surveyed at the International Linear Collider (ILC) experiment at $\sqrt{s}=500$ GeV.
• For the Higgs portal singlet fermion and vector DM cases, the force mediator involves two scalar propagators, the SM-like Higgs boson and the dark Higgs boson.