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In order to identify the Higgs sector using future precision data, wecalculate the partial decay widths of the discovered Higgs boson with the massof 125 GeV into fermion pairs and gauge-boson pairs with one-loop electroweakand one-loop QCD corrections in various extended Higgs models, such as theHiggs singlet model and four types of two Higgs doublet models. In thetree-level analysis, the patterns of deviations from the standard modelpredictions in the partial decay widths for various decay modes are distinctivefor each model, due to the mixing of the Higgs boson with other neutralscalars. Our present analysis shows that even with a full set of radiativecorrections we can discriminate these extended Higgs models via the partialdecay widths as long as any of the deviations is detected at future precisionmeasurements. Furthermore, we quantitatively show that in each model themagnitude of the deviations can provide important information on the mass scaleof extra Higgs bosons under the theoretical constraints from perturbativeunitary and vacuum stability, which can be obtained without discovery of theadditional Higgs bosons.

Loop effects on the Higgs decay widths in extended Higgs models