强子真空极化对轻子反常磁矩的第一性原理贡献。
Hadronic Vacuum Polarization Contribution to the Anomalous Magnetic Moments of Leptons from First Principles.
机构信息
Department of Physics, Bergische Universität Wuppertal, Gaussstrasse 20, D-42119 Wuppertal, Germany.
Institute for Theoretical Physics, Eötvös University, Pázmány Péter sétány 1/A, H-1117 Budapest, Hungary.
出版信息
Phys Rev Lett. 2018 Jul 13;121(2):022002. doi: 10.1103/PhysRevLett.121.022002.
We compute the leading, strong-interaction contribution to the anomalous magnetic moment of the electron, muon, and tau using lattice quantum chromodynamics (QCD) simulations. Calculations include the effects of u, d, s, and c quarks and are performed directly at the physical values of the quark masses and in volumes of linear extent larger than 6 fm. All connected and disconnected Wick contractions are calculated. Continuum limits are carried out using six lattice spacings. We obtain a_{e}^{LO-HVP}=189.3(2.6)(5.6)×10^{-14}, a_{μ}^{LO-HVP}=711.1(7.5)(17.4)×10^{-10} and a_{τ}^{LO-HVP}=341.0(0.8)(3.2)×10^{-8}, where the first error is statistical and the second is systematic.
我们使用格点量子色动力学（QCD）模拟计算了电子、μ 子和 τ 子的反常磁矩的领头、强相互作用贡献。计算包括 u、d、s 和 c 夸克的效应，并直接在夸克质量的物理值和线性延伸超过 6fm 的体积上进行。所有的连接和不连接 Wick 收缩都被计算了。使用六个晶格间距进行连续体极限的计算。我们得到 a_{e}^{LO-HVP}=189.3(2.6)(5.6)×10^{-14}，a_{μ}^{LO-HVP}=711.1(7.5)(17.4)×10^{-10} 和 a_{τ}^{LO-HVP}=341.0(0.8)(3.2)×10^{-8}，其中第一个误差是统计误差，第二个是系统误差。
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