Measurement of the spectral function for the ${\tau }^{-}\to K^{-}{K}_S{\nu }_{\tau }$ decay in BABAR experiment

Abstract

The decay ${\tau }^{-}\to K^{-}{K}_S{\nu }_{\tau }$ has been studied using $430\times 10^6$ $e^{+}{e}^{-}\to {\tau }^{+}{\tau }^{-}$ events produced at a center-of-mass energy around 10.6 GeV at the PEP-II collider and studied with the BABAR detector. The mass spectrum of the $K^{-}{K}_S$ system has been measured and the spectral function has been obtained. The measured branching fraction $\mathcal{B}({\tau }^{-}\to K^{-}{K}_S{\nu }_{\tau })=(0.739\pm 0.011(stat.)\pm 0.020(syst.))\times 10^{-3}$ is found to be in agreement with earlier measurements.

arXiv comment9 pages, 6 figures, Poster talk at the 15-th International Conference on Tau Lepton Physics, 24-28 September 2018, Amsterdam, Netherlands

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