Search forB0→π−τ+ντwith hadronic tagging at Belle
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Abstract
We search for the process ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ using the full Belle data set of $711\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, corresponding to $772\ifmmode\times\else\texttimes\fi{}{10}^{6}B\overline{B}$ pairs, collected at the $\mathrm{\ensuremath{\Upsilon}}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We reconstruct one $B$ meson in a hadronic decay and search for the ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}$ process in the remainder of the event. No significant signal is observed and an upper limit of $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\tau}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}})<2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$ is obtained at the 90% confidence level.