Two-flavor QCD correction to lepton magnetic moments at leading order in the electromagnetic coupling.
Two-flavor QCD correction to lepton magnetic moments at leading order in the electromagnetic coupling.
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DOI：
10.1103/physrevlett.107.081802
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发表时间：
2011-03
影响因子：
8.6
通讯作者：
Xu Feng;K. Jansen;M. Petschlies;D. Renner
中科院分区：
文献类型：
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作者：
Xu Feng;K. Jansen;M. Petschlies;D. Renner
我们提出了一种可靠的 QCD 校正非微扰计算，在电磁耦合的主阶上，使用双味晶格 QCD 对电子、μ 子和 τ 轻子的反常磁矩进行校正。我们使用多个晶格间距、多个体积和广泛的夸克质量来控制连续体、无限体积和手性极限。我们研究了通常被忽视的断开图的影响，并对之前使用的方法进行了修改，从而实现了良好控制的晶格计算。我们对电子、μ子和τ子的反常磁矩进行前阶二味QCD校正，分别得到1.513(43)×10(-12)、5.72(16)×10(-8)和2.650(54)×10(-6)，精度均优于3%。
We present a reliable nonperturbative calculation of the QCD correction, at leading order in the electromagnetic coupling, to the anomalous magnetic moment of the electron, muon, and tau leptons using two-flavor lattice QCD. We use multiple lattice spacings, multiple volumes, and a broad range of quark masses to control the continuum, infinite-volume, and chiral limits. We examine the impact of the commonly ignored disconnected diagrams and introduce a modification to the previously used method that results in a well-controlled lattice calculation. We obtain 1.513(43)×10(-12), 5.72(16)×10(-8), and 2.650(54)×10(-6) for the leading-order two-flavor QCD correction to the anomalous magnetic moment of the electron, muon, and tau, respectively, each accurate to better than 3%.