Exclusive Branching-Fraction Measurements of Semileptonic τ Decays into Three Charged Hadrons, into φπ−ντ , and into φK−ντ

Le résumé fourni par la source

Using a data sample corresponding to an integrated luminosity of $342\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with the BABAR detector at the SLAC PEP-II electron-positron storage ring operating at a center-of-mass energy near 10.58 GeV, we measure $\mathcal{B}\mathbf{(}{\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}(\mathrm{ex}.{K}_{S}^{0})\mathbf{)}=(8.83\ifmmode\pm\else\textpm\fi{}0.01\ifmmode\pm\else\textpm\fi{}0.13)%$, $\mathcal{B}\mathbf{(}{\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}(\mathrm{ex}.{K}_{S}^{0})\mathbf{)}=(0.273\ifmmode\pm\else\textpm\fi{}0.002\ifmmode\pm\else\textpm\fi{}0.009)%$, $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{K}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(0.1346\ifmmode\pm\else\textpm\fi{}0.0010\ifmmode\pm\else\textpm\fi{}0.0036)%$, and $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(1.58\ifmmode\pm\else\textpm\fi{}0.13\ifmmode\pm\else\textpm\fi{}0.12)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where the uncertainties are statistical and systematic, respectively. These include significant improvements over previous measurements and a first measurement of $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}})$ in which no resonance structure is assumed. We also report a first measurement of $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(3.42\ifmmode\pm\else\textpm\fi{}0.55\ifmmode\pm\else\textpm\fi{}0.25)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, a new measurement of $\mathcal{B}({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\phi}{K}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(3.39\ifmmode\pm\else\textpm\fi{}0.20\ifmmode\pm\else\textpm\fi{}0.28)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ and a first upper limit on $\mathcal{B}\mathbf{(}{\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\nu}}_{\ensuremath{\tau}}(\mathrm{ex}.\ensuremath{\phi})\mathbf{)}$.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.