Abstract
The feasibility of measuring the Higgs-boson properties at the Photon Collider at TESLA has been studied in detail for masses between 200 and 350 GeV, using realistic luminosity spectra and detector simulation. We consider the Two Higgs Doublet Model (II) with SM-like Yukawa couplings for h, parametrized by only one parameter (tan ?). The combined measurement of the invariant-mass distributions in the ZZ and W+W? decay-channels is sensitive to both the two-photon width ??? and phase ??. From the analysis including systematic uncertainties we found out that after one year of Photon Collider running with nominal luminosity the expected precision in the measurement of tan ? is of the order of 10%, for both light (h) and heavy (H) scalar Higgs bosons. The H?A mixing angle ?HA, characterizing a weak CP violation in the model with two Higgs doublets, can be determined to about 100 mrad, for low tan ?.
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