Flavor physics in supersymmetric models

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1. B Physics in supersymmetric modelsCP violation and Flavor changing neutral current processes in B meson decays provide an indirect but powerful method to search for new particles and new interactions beyond the Standard Model. In this research, various B decay observable quantities are calculated in supersymmetrc models based on grand unification and flavor symmetry, and clarify how to distinguish different models by combining various B observables. In addition, B decay processes including final tau particles, which is sensitive to existence of a charged Higgs boson, are evaluated including quantum corrections due to supersymmetric particles. The results of these researches are used for KEK and SLAC efforts of Super B Factory planning.2. Phenomenology of lepton flavor violating processes.Search for lepton flavor violation is another important way to look for new physics effects in flavor physics. Here, we develop phenomenology of tau lepton flavor violation and mu-e conversion in nuclei in general framework. Furthermore, muon lepton flavor violating processes are calculated in supersymmetric see-saw model, and it is pointed out that the mu-e conversion process is particularly important in a special parameter region.3. Physics of Higgs particleHiggs physics will become a central issue in particle physics in coining years. Here, we consider measurement of the Higgs potential in future electron positron linear collider experiments, and clarify its meanings in new physics search and electroweak baryogenesis by studying examples of a two Higgs doublet model and a supersymmetric model.