Mason Q, Trottier H D, Davies C T H, Foley K, Gray A, Lepage G P, Nobes M, Shigemitsu J
Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, United Kingdom.
Phys Rev Lett. 2005 Jul 29;95(5):052002. doi: 10.1103/PhysRevLett.95.052002. Epub 2005 Jul 28.
We obtain a new value for the QCD coupling constant by combining lattice QCD simulations with experimental data for hadron masses. Our lattice analysis is the first to (1) include vacuum polarization effects from all three light-quark flavors (using MILC configurations), (2) include third-order terms in perturbation theory, (3) systematically estimate fourth and higher-order terms, (4) use an unambiguous lattice spacing, and (5) use an symbol: see text-accurate QCD action. We use 28 different (but related) short-distance quantities to obtain alpha((5)/(MS))(M(Z)) = 0.1170(12).
我们通过将格点量子色动力学（QCD）模拟与强子质量的实验数据相结合，获得了QCD耦合常数的一个新值。我们的格点分析首次做到了：（1）纳入来自所有三种轻夸克味的真空极化效应（使用MILC组态）；（2）纳入微扰理论中的三阶项；（3）系统地估计四阶及更高阶项；（4）使用明确无误的格点间距；以及（5）使用一个符号：见原文精确的QCD作用量。我们使用28个不同（但相关）的短程量来得到α((5)/(MS))(M(Z)) = 0.1170(12) 。
