KEK Theory seminar（ Dr. Kodai Sakurai）
（ABSTRACT） Precision measurements of observables for the discovered Higgs boson, such as decay rates and production cross sections, play a crucial role in examining structure of the Higgs sectors. By making use of precise data of Higgs observables in future collider experiments, we aim to comprehensively test various extended Higgs models. To achieve such our goal, we previously calculated full set of renormalized Higgs boson couplings at the 1-loop level in various extended Higgs models such as the Higgs singlet model, 4 types of two Higgs doublet models and the inert doublet model. Applying those calculations, we recently computed decay rates of the Higgs boson with NLO EW and NLO QCD corrections in above models. In this talk, we discuss whether or not these models can be discriminated with deviations from the SM for the Higgs decay rates and how we extract information of mass scale of second Higgs bosons. This talk is based on arXiv:1803.01456.