# Measurement of the spectral function for the $τ^-\to K^-K_Sν_τ$ decay in BABAR experiment

### Submission summary

 As Contributors: Sergey Serednyakov Arxiv Link: https://arxiv.org/abs/1810.06242v2 (pdf) Date accepted: 2019-01-17 Date submitted: 2018-12-07 01:00 Submitted by: Serednyakov, Sergey Submitted to: SciPost Physics Proceedings Proceedings issue: The 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09) Academic field: Physics Specialties: High-Energy Physics - Experiment Approach: Experimental

### Abstract

The decay $\tau^{-}\to K^{-}K_S\nu_{\tau}$ has been studied using $430\times10^6$ $e^+e^-\to \tau^+\tau^-$ 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 ${\cal B}(\tau^{-}\to K^{-}K_S\nu_{\tau}) = (0.739\pm 0.011(\rm stat.)\pm 0.020(\rm syst.))\times 10^{-3}$ is found to be in agreement with earlier measurements.

Published as SciPost Phys. Proc. 1, 046 (2019)