Measurement of Cabibbo-Suppressed Decays of theτLepton

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Abstract

Branching ratios for the dominant Cabibbo-suppressed decays of the $\ensuremath{\tau}$ lepton have been measured by CLEO II in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation at the Cornell Electron Storage Ring ($\sqrt{s}\ensuremath{\sim}10.6$ GeV) using kaons with momenta below 0.7 GeV/c. The inclusive branching ratio into one charged kaon is (1.60 \ifmmode\pm\else\textpm\fi{} 0.12 \ifmmode\pm\else\textpm\fi{} 0.19)%. For the exclusive decays, $B({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(0.66\ifmmode\pm\else\textpm\fi{}0.07\ifmmode\pm\else\textpm\fi{}0.09)%$, $B({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})=(0.51\ifmmode\pm\else\textpm\fi{}0.10\ifmmode\pm\else\textpm\fi{}0.07)%$, and, based on three events, $B({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}2{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})<0.3%$ at the 90% confidence level. These represent significant improvements over previous results. $B({\ensuremath{\tau}}^{\ensuremath{-}}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}{\ensuremath{\nu}}_{\ensuremath{\tau}})$ is measured for the first time with exclusive ${\ensuremath{\pi}}^{0}$ reconstruction.

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