Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{*+} τ^- \barν_τ$ relative to $\bar{B}^0 \rightarrow D^{*+} \ell^- \barν_{\ell}$ decays with a semileptonic tagging method
KEKB
Bar (unit)
Branching fraction
B meson
Semileptonic decay
Electron–positron annihilation
DOI:
10.48550/arxiv.1603.06711
Publication Date:
2016-01-01
AUTHORS (444)
ABSTRACT
We report a measurement of ratio ${\cal R}(D^*) = {\cal B}(\bar{B}^0 \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau})/{\cal \ell^- \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or muon. The results are based on data sample containing $772\times10^6$ $B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with Belle detector KEKB $e^+ e^-$ collider. select $B^0 \bar{B}^0$ by reconstructing both $B$ mesons in semileptonic decays to $D^{*\mp} \ell^{\pm}$. measure R}(D^*)= 0.302 \pm 0.030({\rm stat)} 0.011({\rm syst)}$, which is within $1.6 \sigma$ Standard Model theoretical expectation, $\sigma$ standard deviation including systematic uncertainties.
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