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arXiv 2006.00660hep-ph
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在$e^-e^+$对撞机上的Tau $g-2$与动量相关的形状因子

Tau $g-2$ at $e^-e^+$ colliders with momentum dependent form factor

Hieu Minh Tran, Yoshimasa Kurihara

摘要:

标准模型预测和μ子g-2测量之间的偏差目前为3-4 sigma(在即将到来的实验E989中可能高达7 sigma)。如果新的物理学是造成这种差异的原因,那么由于μ介子的大质量,预计对τ g-2的新贡献甚至比μ介子的贡献更大。尽管如此,由于tau g-2的寿命很短,直接测量它要困难得多。在本文中,我们考虑了在$e^-e^+$对撞机的tau g-2的影响,在一个模型无关的方式。利用大型电子位置对撞机(LEP)上的τ对产生通道,我们发现了τ g-2的新物理贡献的允许范围,假设磁形状因子与$q^2$相关。在我们的分析中,我们考虑了标准模型的单圈修正以及初始状态的光子辐射。我们还调查了在未来的$e^-e^+$对撞机的前景,并确定预期允许的范围内的新的物理贡献的τ g-2。给出了在国际直线对撞机(ILC)上提出的光束偏振配置,分析了该允许范围对积分亮度以及相对系统误差的依赖关系。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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