Z 极点处 QED 耦合常数的测定
高能物理 - 唯象学
2009-10-28 v3
摘要
我们仔细审视了强子贡献对 QED 耦合常数 α 从 Q²=0 到 Q²=M_Z² 演化的评估。利用 e⁺e⁻→强子的数据，我们发现 α(M_Z²)⁻¹ = 128.99 ± 0.06，而现有值为 128.87 ± 0.12。
引用
@article{arxiv.hep-ph/9411377,
title = {A determination of the QED coupling at the $Z$ pole},
author = {A. D. Martin and D. Zeppenfeld},
journal= {arXiv preprint arXiv:hep-ph/9411377},
year = {2009}
}
备注
We have made refinements to the calculation of the contribution to $\alpha(M_Z^2)$ from the $\pi^+\pi^-$ production, and from the region just above the $\psi$ resonances, including, in particular, a study of the implications of the Crystal Ball data for $R$. These refinements slightly reduce the value of $\alpha(M_Z^2)^{-1}$ from $129.10\pm 0.06$ to $128.99\pm 0.06$. Standard Latex, 12 pages. Four uufiled postscript files included. Compressed postscript version with figures available via anonymous ftp at ftp://phenom.physics.wisc.edu/pub/preprints/current/