Study of τ−→KSπ−ντ decay with Belle

The report presents a study of τ−→KSπ−ντ decay using a data sample corresponding to an integrated luminosity of 351 fb−1 collected by the Belle detector. The analysis is based on 55017 lepton-tagged signal events. The measured branching ratio B(τ→KSπντ)=(0.391±0.004stat±0.014syst)% is consistent with the PDG value and has much better accuracy.