Search for B0→τ±ℓ∓ ( ℓ=e , μ ) with a hadronic tagging method at Belle

Le résumé fourni par la source

We present a search for the lepton-flavor-violating decays ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\ell}}^{\ensuremath{\mp}}$, where $\ensuremath{\ell}=(e,\ensuremath{\mu})$, using the full data sample of $772\ifmmode\times\else\texttimes\fi{}{10}^{6}\text{ }\text{ }B\overline{B}$ pairs recorded by the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. We use events in which one $B$ meson is fully reconstructed in a hadronic decay mode. The ${\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}$ lepton is reconstructed indirectly using the momentum of the reconstructed $B$ and that of the ${\ensuremath{\ell}}^{\ensuremath{\mp}}$ from the signal decay. We find no evidence for ${B}^{0}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\ell}}^{\ensuremath{\mp}}$ decays and set upper limits on their branching fractions at 90% confidence level of $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}})<1.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and $\mathcal{B}({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\tau}}^{\ifmmode\pm\else\textpm\fi{}}{e}^{\ensuremath{\mp}})<1.6\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$.

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