Impact of light Higgs properties on the determination of tan β and m_susy

We examine whether parameters related to the Higgs sector of the minimal supersymmetric standard model can be determined by detailed study of the production cross section and decay branching ratios of the Higgs boson. Assuming that only the light Higgs boson will be observed at a future e⁺e^- linear collider with √s = 300 ∼ 500 GeV, we show that values of m_susy and tan β are restricted within a narrow region in the m_susy versus tan β plane by the combined analysis of the light Higgs properties. It is also pointed out that, in some case, tan β may be restricted to a relatively small value, tan β = 1 ∼ 5.