论文标题
测量ILC处的Tau极化
Measuring the tau polarization at ILC
论文作者
论文摘要
\ eett \中tau Lepton极化的测量是ILC和其他将来的电子峰壳的重要电动测量。在本文中，我们讨论了在名义中心能量上\ eett \事件提取偏振仪信息的几种方法，并基于带电的粒子冲击参数测量的新方法开发了一种新方法，即使在具有重要初始状态辐射的事件中，也可以准确地重建tau momenta。 在未来的工作中，我们将扩展研究，以估计可以在ILC-250处测量Tau极化的精度，包括高质量Tau对以及辐射返回到$ Z^0 $峰的tau偏振。这将补充我们过去的研究，该研究表明，在ILC-500时，TAU极化可以比1 \％更好。
Measurement of the tau lepton polarization in \eett\ is an important electro-weak measurement at ILC and other future electron-positron colliders. In this paper we discuss several methods to extract polarimeter information for \eett\ events at the nominal centre-of-mass energy, and develop a new method, based on charged particle impact parameter measurement, which can accurately reconstruct tau momenta even in events with significant Initial State Radiation. In future work we will extend the study to estimate the precision with which the tau polarization can be measured at ILC-250, both for high-mass tau pairs and for those which radiatively return to the $Z^0$ peak. This will complement our past study which showed that the tau polarization can be measured to better than 1\% at the ILC-500.
