Two-Flavor QCD Correction to Lepton Magnetic Moments at Leading Order in the Electromagnetic Coupling

被引：56

作者：

Feng, Xu ^{[1
,2
]}

Jansen, Karl ^{[1
]}

Petschlies, Marcus ^{[3
]}

Renner, Dru B. ^{[1
]}

机构：

[1] DESY, NIC, D-15738 Zeuthen, Germany

[2] Univ Munster, Inst Theoret Phys, D-48149 Munster, Germany

[3] Humboldt Univ, Inst Phys, D-12489 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 08期

关键词：

MUON G-2;

D O I：

10.1103/PhysRevLett.107.081802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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) x 10(-12), 5.72(16) x 10(-8), and 2.650(54) x 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%.

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