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We report an observation of the decay B0 -> D*- tau+ nu and a search for therare decays B -> h(*) nu nubar\ove, where h(*) stands for a light meson. A datasample of 535 million BBbar pairs collected with the Belle detector at the KEKBe+e- collider is used. We find a signal with a significance of 5.2 standarddeviations on B0 -> D*- tau+ nu and measure the branching fraction to be 2.02+0.40/-0.37 (stat.) +- 0.37 (syst.)%. No significant signal is observed for B-> h(*) nu nubar decays and we set upper limits on the branching fractions at90% confidence level. The limits on B0 -> K*0 nu nubar and B+ -> K+ nu nubardecays are more stringent than the previous constraints, while the firstsearches for B0 -> K0 nu nubar, pi0 nu nubar, rho0 nu nubar, phi nu nubar andB+ -> K*+ nu nubar, rho+ nu nubar are presented.

Measurement of B -> D*- tau+ nu and B -> h(*) nu nubar Decays at Belle

Measurement of B -> D- tau+ nu and B -> h() nu nubar Decays at Belle