关于 "静止框架中的非局部核子矩阵元素 "的评论

Xiang Gao, Jinchen He, Yushan Su, Rui Zhang, Yong Zhao
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摘要

在最近的一篇论文 "静止框架中的非局部核子矩阵元"(arXiv: 2407.16577)中,我们证明了次高阶扰动理论能够以百分之几的精度描述空间相关子的晶格QCD静态核子矩阵元,其距离可达0.6~fm。我们认为,在对相关大对数进行重和之后,扰动 QCD 会在这样的距离尺度上崩溃,而分析中使用的解析式没有考虑重和或前导正则子,而这两者都会显著影响扰动理论的收敛性。此外,我们还解释了为什么尽管在大距离上扰动理论会崩溃,但该解析似乎仍能描述晶格数据。
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Comments on "Non-local Nucleon Matrix Elements in the Rest Frame"
In a recent paper, "Non-local Nucleon Matrix Elements in the Rest Frame" (arXiv: 2407.16577), it was demonstrated that the next-to-leading order perturbative theory can describe, to a few percent accuracy, the lattice QCD static nucleon matrix elements of spatial correlators with separations up to 0.6~fm. We argue that perturbative QCD breaks down at such a distance scale after resumming the associated large logarithms, while the ansatz used in the analysis there did not account for resummation or the leading renormalon, both of which significantly affect the convergence of perturbation theory. Besides, we provide an explanation why the ansatz appears to describe the lattice data despite the breakdown of perturbation theory at large distances.
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