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In the two Higgs doublet model, $\tan\beta$ is an important parameter, whichis defined as the ratio of the vacuum expectation values of the doublets. Westudy how accurately $\tan\beta$ can be determined at linear colliders via theprecision measurement of the decay branching fraction of the standard model(SM) like Higgs boson. Since the effective coupling constants of the Higgsboson with the weak gauge bosons are expected to be measured accurately, thebranching ratios can be precisely determined. Consequently, $\tan\beta$ can bedetermined with a certain amount of accuracy. Comparing the method to thoseusing direct production of the additional Higgs bosons, we find that, dependingon the type of Yukawa interactions, the precision measurement of the decay ofthe SM-like Higgs boson can be the best way to determine $\tan\beta$, when thedeviations in the coupling constants with the gauge boson from the SMprediction are observed at linear colliders.

Determination of tan(beta) from the Higgs boson decay at linear colliders