Abstract:

Study of the hadronic decay of tau lepton is important for understanding the elemental parameters of the Standard Model, such as Vus, ms and alpha_s. The importance of this study has developed since the measurement of Vus from tau decays bythe BaBar experiment, which showed large discrepancy with previous Kaon decay results. In this talk, a review and the implications of the results of hadronic tau lepton decay studies in the Belle experiment will be given, together with some of the results from BaBar experiment. A special focus will be given to the Vus measurement and an issue of mass spectrum measurement. A short review on the Belle and Belle-II experiment (and their status) will be covered also.