Feasibility study of CP violation in decays at the Super Tau Charm Facility Supported by the Double First-Class university project foundation of USTC, USTC Research Funds of the Double First-Class Initiative YD2030002005 and the National Natural Science Foundation of China (11625523). The author XWK is supported by the National Natural Science Foundation of China (11805012) and the Fundamental Research Funds for the Central Universities,Chinese Physics C

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Feasibility study of CP violation in decays at the Super Tau Charm Facility Supported by the Double First-Class university project foundation of USTC, USTC Research Funds of the Double First-Class Initiative YD2030002005 and the National Natural Science Foundation of China (11625523). The author XWK is supported by the National Natural Science Foundation of China (11805012) and the Fundamental Research Funds for the Central Universities
Chinese Physics C ( IF 3.6 ) Pub Date : 2021-04-22 , DOI: 10.1088/1674-1137/abeb07
Haoyu Sang _{1,

2} , Xiaodong Shi _{1,

2} , Xiaorong Zhou _{1,

2} , Xianwei Kang _{3,

4} , Jianbei Liu _{1,

2}

Affiliation

We report a feasibility study for violation in $\tau^{-}\rightarrow K_{S}\pi^{-} \nu_{\tau}$ decays 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 CP violation is determined to be of order $9.7\times10^{-4}$ by measuring the decay-rate difference between $\tau^{+}\rightarrow K_{S}\pi^{+}\bar{\nu}_{\tau}$ and $\tau^{-}\rightarrow K_{S}\pi^{-} \nu_{\tau}$ . 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 $\tau^{-}\rightarrow K_{S}\pi^{-} \nu_{\tau}$ are presented. The expected CP sensitivity is proportional to $1/\sqrt{\cal{L}}$ in the energy region from 4.0 to 5.0 GeV. The sensitivity of CP violation is of order $3.1\times10^{-4}$ with 10 ab $^{-1}$ integrated luminosity, which is equivalent to ten years' data taking in this energy region at STCF.

更新日期：2021-04-22

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