论文标题
$ cp $违规的可行性研究$τ^{ - } \ to k_ {s}π^{ - }ν_τ$在超级tau
Feasibility study of $CP$ Violation in $τ^{-}\to K_{S}π^{-}ν_τ$ decays at Super Tau Charm Facility
论文作者
论文摘要
我们报告了$ cp $违反$τ^{ - } \ rightarrow k_ {s}π^{ - }ν_τ$衰减的可行性研究。 $ cp $违规被确定为$ 9.7 \ times10^{ - 4} $，通过测量$τ^{+} \ rightArrow k_ {s} s} s} ph {+} \barν_τ$和$ firct^$ the of $τ^{+rightArrow k_ {+rightArrow k_ {+rightarrow k_ {+rightArrow k_ { - } { - } \ righorAw k________分析是使用可靠的快速模拟软件包进行的，该软件包可以正确地描述检测器响应，并灵活地改变响应以进一步优化。此外，提出了重建$τ^{ - } \ rightArrow k_ {s}π^{ - }ν_τ$的能量依赖的效率，并且预期的$ cp $敏感性与$ 1/\ sqrt {\ sqrt {\ nathcal {\ nathcal {l}} $ 0. 0.0 g。 $ cp $违规的敏感性为$ 3.1 \ times10^{ - 4} $，带有10〜Ab $^{ - 1} $集成的发光度，相当于STCF的该能量区域的十年数据。
We report a feasibility study of $CP$ violation of $τ^{-}\rightarrow K_{S}π^{-} ν_τ$ 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 $9.7\times10^{-4}$ by measuring the decay-rate difference between $τ^{+}\rightarrow K_{S}π^{+}\barν_τ$ and $τ^{-}\rightarrow K_{S}π^{-} ν_τ$. 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 $τ^{-}\rightarrow K_{S}π^{-} ν_τ$ 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 $3.1\times10^{-4}$ with 10~ab$^{-1}$ integrated luminosity, which is equivalent to ten years data taking in this energy region at STCF.
