Feasibility study of $CP$ Violation in ${\tau }^{-}\to K_S{\pi }^{-}{\nu }_{\tau }$ decays at Super Tau Charm Facility

Abstract

We report a feasibility study of $CP$ violation of ${\tau }^{-}\to K_S{\pi }^{-}{\nu }_{\tau }$ decay at a Super Tau Charm Facility~(STCF).With an expected luminosity of 1~ab${}^{-1}$ collected by STCF per year at a center-of-mass energy of 4.26 GeV, the statistical sensitivity for the $CP$ violation is determined to be of order $9.7\times 10^{-4}$ by measuring the decay-rate difference between ${\tau }^{+}\to K_S{\pi }^{+}{\bar{\nu }}_{\tau }$ and ${\tau }^{-}\to K_S{\pi }^{-}{\nu }_{\tau }$. The analysis is performed using a reliable fast simulation software package, which can describe the detector responses properly and vary the responses flexibly for further optimization. Moreover, the energy-dependent efficiencies for reconstructing ${\tau }^{-}\to K_S{\pi }^{-}{\nu }_{\tau }$ are presented and the expected $CP$ sensitivity is proportional to $1/\sqrt{\mathcal{L}}$ in the energy region from 4.0 to 5.0 GeV. The sensitivity of $CP$ violation is of order $3.1\times 10^{-4}$ with 10~ab${}^{-1}$ integrated luminosity, which is equivalent to ten years data taking in this energy region at STCF.

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