Nucleon isovector couplings from Nf = 2 lattice QCD
Nucleon isovector couplings from Nf = 2 lattice QCD
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Nf = 2 晶格 QCD 的核子等矢量耦合
DOI：
10.1103/physrevd.91.054501
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发表时间：
2015
影响因子：
5
通讯作者：
G.S. Bali
中科院分区：
文献类型：
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作者：
G.S. Bali
我们使用质量简并非微扰改进的 Wilson-Sheikholeslami-Wohlert 费米子计算核子的轴向、标量、张量和赝标量等矢量耦合，以及晶格模拟中的感应张量和赝标量电荷。模拟在 150 MeV 的 π 介子质量和高达 4.6 fm 的线性空间晶格范围（范围从大约 0.08 fm 到 0.06 fm 的三种不同晶格间距）下进行。仔细研究了可能的激发态污染并研究了有限体积效应。在这些晶格间距下确定的耦合被外推到物理π介子质量。在这个极限下，我们发现与实验结果一致（如果存在这些结果），但磁矩除外。由于我们的晶格常数范围有限，无法执行适当的连续极限，但没有检测到显着的晶格间距依赖性。估计离散化效应的上限，这些上限决定了误差预算。
We compute the axial, scalar, tensor and pseudoscalar isovector couplings of the nucleon as well as the induced tensor and pseudoscalar charges in lattice simulations withmass-degenerate nonperturbatively improved Wilson-Sheikholeslami-Wohlert fermions. The simulations are carried out down to a pion mass of 150 MeV and linear spatial lattice extents of up to 4.6 fm at three different lattice spacings ranging from approximately 0.08 fm to 0.06 fm. Possible excited state contamination is carefully investigated and finite volume effects are studied. The couplings, determined at these lattice spacings, are extrapolated to the physical pion mass. In this limit we find agreement with experimental results, where these exist, with the exception of the magnetic moment. A proper continuum limit could not be performed, due to our limited range of lattice constants, but no significant lattice spacing dependence is detected. Upper limits on discretization effects are estimated and these dominate the error budget.
质子与动力学威尔逊费米子的味单线态轴向耦合
DOI：
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发表时间：
1999
期刊：
影响因子：
--
作者：
S. Güsken;K. Schilling;N. Eicker;A. Spitz;T. Lippert;T. Struckmann;J. Viehoff;P. Ueberholz
通讯作者：
P. Ueberholz