Predictions for g-2 of the muon and alpha_QED(M_Z^2)
Predictions for g-2 of the muon and alpha_QED(M_Z^2)
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μ 子的 g-2 和 alpha_QED(M_Z^2) 的预测
DOI：
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发表时间：
2003
期刊：
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通讯作者：
T. Teubner
中科院分区：
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作者：
K. Hagiwara;Alan D. Martin;D. Nomura;T. Teubner
通过改进对强子真空极化贡献及其不确定性的测定，我们计算了μ子的（g-2）和QED耦合α（M_Z^2）。我们包括了最近重新分析的CMD-2关于e^+e^- -> pi^+ pi^-的数据。我们仔细地将各种各样的强子e^+e^-产生的数据联合收割机组合起来，得到了R（s）= sigma_had^0（s）/sigma_pt（s）的最佳形式及其不确定性。我们的结果表明μ子对g-2的强子贡献为a_mu^（had，LO）=（692.4 +- 5.9_exp +- 2.4_rad）* 10^（-10）和a_mu^（had，NLO）=（-9.8 +- 0.1_exp +- 0.0_rad）* 10^（-10），而对于QED耦合Δ α ^（5）_had（M_Z^2）=（275.5 +- 1.9_exp +- 1.3_rad）* 10^（-4）。由此得出（g-2）/2 = 0.00116591763（74），比目前世界平均测量值低约2.4 σ，α（M_Z^2）^（-1）= 128.954 +-0.031。我们将我们的（g-2）值与其他预测进行比较，特别是与Davier等人最新确定的（g-2）值进行详细比较。
We calculate (g-2) of the muon and the QED coupling alpha(M_Z^2), by improving the determination of the hadronic vacuum polarization contributions and their uncertainties. We include the recently re-analysed CMD-2 data on e^+e^- -> pi^+ pi^-. We carefully combine a wide variety of data for the e^+e^- production of hadrons, and obtain the optimum form of R(s) = sigma_had^0(s)/sigma_pt(s), together with its uncertainty. Our results for the hadronic contributions to g-2 of the muon are a_mu^(had, LO) = (692.4 +- 5.9_exp +- 2.4_rad) * 10^(-10) and a_mu^(had, NLO) = (-9.8 +- 0.1_exp +- 0.0_rad) * 10^(-10), and for the QED coupling Delta alpha^(5)_had (M_Z^2)= (275.5 +- 1.9_exp +- 1.3_rad) * 10^(-4). These yield (g-2)/2 = 0.00116591763(74), which is about 2.4 sigma below the present world average measurement, and alpha(M_Z^2)^(-1) = 128.954 +- 0.031. We compare our (g-2) value with other predictions and, in particular, make a detailed comparison with the latest determination of (g-2) by Davier et al.