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We present a study of the decay tau- -> K_S pi- nu_tau using a 351 fb^-1 datasample collected with the Belle detector. The analysis is based on 53110lepton-tagged signal events. The measured branching fraction B(tau- -> K_S pi-nu_tau)=(0.404 +- 0.002(stat.) +- 0.013(syst.))% is consistent with the worldaverage value and has better accuracy. An analysis of the K_S pi- invariantmass spectrum reveals contributions from the K*(892)- as well as other states.For the first time the K*(892)- mass and width have been measured in tau decay:M(K*(892)-)=(895.47 +- 0.20(stat.) +- 0.44(syst.) +- 0.59(mod.)) MeV/c2,Gamma(K*(892)-)=(46.2 +- 0.6(stat.) +- 1.0(syst.) +- 0.7(mod.)) MeV. TheK*(892)- mass is significantly different from the current world average value.

Study of tau- -> K_S pi- nu_tau decay at Belle