Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle

Details Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle Observation of B^0 \to D^{*-} τ^+ ν_τ decay at Belle

2007-06-29

arxiv.org/abs/0706.4429v2

Phys.Rev.Lett.99:191807,2007

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.191807

We report an observation of the decay $B^0\to D^{*-} \tau^+ \nu_{\tau}$ in a data sample containing $535\times10^6$ $B\bar{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We find a signal with a significance of 5.2 standard deviations and measure the branching fraction $\mathcal{B}(B^0\to D^{*-} \tau ^+ \nu_{\tau})=(2.02 ^{+0.40}_{-0.37} (stat) \pm 0.37 (syst)) % $. This is the first observation of an exclusive $B$ decay with a $b \to c \tau \nu_{\tau}$ transition.

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