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

Details 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

2007-08-30

arxiv.org/abs/0708.4089v2

ECONFC070512:006,2007

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 figures, proceedings for Flavor Physics & CP Violation Conference, Bled, 2007

Scientific paper

We report an observation of the decay B0 -> D*- tau+ nu and a search for the rare decays B -> h(*) nu nubar\ove, where h(*) stands for a light meson. A data sample of 535 million BBbar pairs collected with the Belle detector at the KEKB e+e- collider is used. We find a signal with a significance of 5.2 standard deviations 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 at 90% confidence level. The limits on B0 -> K*0 nu nubar and B+ -> K+ nu nubar decays are more stringent than the previous constraints, while the first searches for B0 -> K0 nu nubar, pi0 nu nubar, rho0 nu nubar, phi nu nubar and B+ -> K*+ nu nubar, rho+ nu nubar are presented.

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