论文标题
$ e^-e^-e^+$ colliders的tau $ g-2 $与动量相关的外形
Tau $g-2$ at $e^-e^+$ colliders with momentum dependent form factor
论文作者
论文摘要
标准模型预测与MUON G-2的测量之间的偏差目前为3-4 Sigma（在即将到来的实验E989中，最多可以是7个Sigma）。如果新物理学负责这种差异，则预计由于其质量很大，对Tau G-2的新贡献甚至比Muon的贡献大。尽管如此，由于其寿命短，很难直接测量Tau G-2。在本文中，我们将tau g-2在$ e^-e^+$ colleders以独立的方式考虑。使用大电子位置对撞机（LEP）的tau对生产通道，我们发现tau g-2的新物理贡献允许范围，假设$ q^2 $依赖性的ansatz是磁性型号。在我们的分析中，我们考虑了标准模型的一环校正以及初始状态光子辐射。我们还研究了未来$ e^-e^+$ colliders的前景，并确定了对Tau G-2的新物理贡献的预期范围。鉴于在国际线性对撞机（ILC）处提出的梁极化构型，我们分析了此允许范围对集成光度的依赖性以及相对系统的误差。
The deviation between the standard model prediction and the measurement of the muon g-2 is currently at 3-4 sigma (can be up to 7 sigma in the upcoming experiment E989). If new physics is responsible for such discrepancy, it is expected that the new contributions to tau g-2 are even larger than that for muon due to its large mass. In spite of that, the tau g-2 is much more difficult to be directly measured because of its short lifetime. In this paper, we consider the effect of the tau g-2 at $e^-e^+$ colliders in a model independent way. Using the tau pair production channel at the Large Electron Position Collider (LEP), we have found the allowed range for the new physics contribution of the tau g-2 assuming a $q^2$-dependence ansatz for the magnetic form factor. In our analysis, we take into account the standard model one-loop correction as well as the initial state photon radiation. We have also investigated the prospect at future $e^-e^+$ colliders, and determine the expected allowed range for the new physics contribution to the tau g-2. Given the proposed beam polarization configuration at the International Linear Collider (ILC), we have analyzed the dependence of this allowed range on the integrated luminosity as well as the relative systematic error.
