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

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arxiv 0706.4429 v2 pith:5Y3EUAY4 submitted 2007-06-29 hep-ex

classification hep-ex
keywords decayobservationbelleasymmetric-energybranchingcollectedcollidercontaining
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

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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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. New physics searches via angular distributions of $ \bar{B} \to D^* (\to D \pi) \tau (\to \ell \nu_\tau \bar{\nu}_\ell) \bar{\nu}_\tau$ decays

    hep-ph 2024-11 unverdicted novelty 5.0 of 10

    Introduces a reconstructible angular distribution for B to D* tau nu decays via tau to lepton chain to extract new physics parameters, projecting 5-6% sensitivities from simulation and lattice form factors.

  2. Lepton non-universality in $B$-decays in the minimal leptoquark gauge model

    hep-ph 2019-06 unverdicted novelty 2.0 of 10

    Review of the room left for B-decay anomalies inside the minimal low-energy leptoquark gauge model with SU(4)_C ⊗ SU(2)_L ⊗ U(1)_R symmetry.

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