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arXiv 2408.05910hep-lathep-phnucl-th
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库仑规范下格点计算部分子分布中Gribov副本的系统不确定性

Systematic Uncertainties from Gribov Copies in Lattice Calculation of Parton Distributions in the Coulomb gauge

Xiang Gao, Jinchen He, Rui Zhang, Yong Zhao

AI总结:

本文评估了库仑规范固定中Gribov副本对格点QCD夸克关联函数计算的影响,发现不同Gribov副本策略间的差异与规范噪声相比无统计显著性,证明其系统不确定性在实际部分子分布计算中可以忽略。

摘要:

最近,有人提出在大动量有效理论框架内,从固定在库仑规范下的boosted关联函数中计算部分子分布。该方法不涉及Wilson线,可以大大提高格点QCD计算的效率和精度。然而,人们担心来自Gribov副本的系统不确定性是否得到控制,Gribov副本对应于格点规范固定中的模糊性。本工作对库仑规范固定的夸克关联函数中Gribov副本的影响进行了评估。我们利用不同的库仑规范固定策略,基于格点规范组态选择了两组不同的Gribov副本。我们测试了真空和π介子态中所得空间夸克关联函数的差异。我们的研究结果表明,无论关联范围如何,来自两组Gribov副本的矩阵元的统计误差都随规范组态数量的平方根成比例地减小。与规范噪声相比,不同策略之间的差异没有显示出统计显著性。这表明在实际的夸克部分子分布格点计算中,Gribov副本的影响可以忽略。

英文摘要:

Recently, it has been proposed to compute parton distributions from boosted correlators fixed in the Coulomb gauge within the framework of Large-Momentum Effective Theory. This method does not involve Wilson lines and could greatly improve the efficiency and precision of lattice QCD calculations. However, there are concerns about whether the systematic uncertainties from Gribov copies, which correspond to the ambiguity in lattice gauge-fixing, are under control. This work gives an assessment of the Gribov copies' effect in the Coulomb-gauge-fixed quark correlators. We utilize different strategies for the Coulomb-gauge fixing, selecting two different groups of Gribov copies based on the lattice gauge configurations. We test the difference in the resulted spatial quark correlators in the vacuum and a pion state. Our findings indicate that the statistical errors of the matrix elements from both Gribov copies, regardless of the correlation range, decrease proportionally to the square root of the number of gauge configurations. The difference between the strategies does not show statistical significance compared to the gauge noise. This demonstrates that the effect of the Gribov copies can be neglected in the practical lattice calculation of the quark parton distributions.

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