Search forCPviolation in the decayτ−→π−Ks0(≥Oπ0)ντ

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Abstract

We report a search for $CP$ violation in the decay ${\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{K}_{S}^{0}(\ensuremath{\ge}0{\ensuremath{\pi}}^{0}){\ensuremath{\nu}}_{\ensuremath{\tau}}$ using a data set of $437\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\tau}$-lepton pairs, corresponding to an integrated luminosity of $476\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$, collected with the BABAR detector at the PEP-II asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ storage rings. The $CP$-violating decay-rate asymmetry is determined to be $(\ensuremath{-}0.36\ifmmode\pm\else\textpm\fi{}0.23\ifmmode\pm\else\textpm\fi{}0.11)%$ approximately 2.8 standard deviations from the standard model prediction of $(0.36\ifmmode\pm\else\textpm\fi{}0.01)%$.

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