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A pattern of deviations in coupling constants of Standard Model (SM)-likeHiggs boson from their SM predictions indicates characteristics of an extendedHiggs sector. In particular, Yukawa coupling constants can deviate in differentpatterns in four types of Two Higgs Doublet Models (THDMs) with a softly-brokenZ_2 symmetry. We can discriminate types of THDMs by measuring the pattern ofthese deviations. We calculate Yukawa coupling constants of the SM-like Higgsboson with radiative corrections in all types of Yukawa interactions in orderto compare to future precision data at the International Linear Collider (ILC).We perform numerical computations of scale factors, and evaluate differencesbetween the Yukawa couplings in THDMs and those of the SM at the one-looplevel. We find that scale factors in different types of THDMs do not overlapeach other even in the case with maximum radiative corrections if gaugecouplings are different from the SM predictions large enough to be measured atthe ILC. Therefore, in such a case, we can indirectly determine the type of theTHDM at the ILC even without finding additional Higgs bosons directly.

Radiative corrections to the Yukawa couplings in two Higgs doublet models