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We study phenomenology of electroweak-interacting fermionic dark matter (DM)with a mass of $\mathcal{O}(100)$ GeV. Constructing the effective Lagrangianthat describes the interactions between the Higgs boson and the SU(2)$_L$isospin multiplet fermion, we evaluate the electric dipole moment (EDM) ofelectron, the signal strength of Higgs boson decay to two photons and thespin-independent elastic-scattering cross section with proton. Asrepresentative cases, we consider the SU(2)$_L$ triplet fermions withzero/nonzero hypercharges and SU(2)$_L$ doublet fermion. It is found that theelectron EDM gives stringent constraints on those model parameter spaces. Inthe cases of the triplet fermion with zero hypercharge and the doublet fermion,the Higgs signal strength does not deviate from the standard model predictionby more than a few % once the current DM direct detection constraint is takeninto account, even if the CP violation is suppressed. On the contrary,$\mathcal{O}(10$-$20)$ % deviation may occur in the case of the triplet fermionwith nonzero hypercharge. Our representative scenarios may be tested by thefuture experiments.

Effective Interaction of Electroweak-Interacting Dark Matter with Higgs Boson and Its Phenomenology