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arXiv 2007.06590hep-lathep-exhep-phnucl-exnucl-th
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格点量子色动力学中π介子的价部分子分布:接近连续性

Valence parton distribution of pion from lattice QCD: Approaching continuum

Xiang Gao, Luchang Jin, Christos Kallidonis, Nikhil Karthik, Swagato Mukherjee, Peter Petreczky, Charles Shugert, Sergey Syritsyn, Yong Zhao

摘要:

我们提出了一个高统计的格点量子色动力学确定的价部分子分布函数(PDF)的介子,质量为300 MeV,使用两个非常精细的晶格间距$a=0.06$ fm和0.04 fm。我们重建的$x$依赖的PDF,以及推断的前几个偶数时刻的PDF使用领先扭转1-循环微扰匹配框架。我们的分析使用RI-π和比率为基础的计划,重整化的π介子的等时间双局域夸克双线性矩阵元素提升到2.4 GeV的动量。我们使用各种模型独立和模型依赖的分析来推断价PDF的大$x$行为。我们还提出了技术研究的晶格间距和更高的扭曲修正目前在升压π矩阵元素。

英文摘要:

We present a high-statistics lattice QCD determination of the valence parton distribution function (PDF) of the pion, with a mass of 300 MeV, using two very fine lattice spacings of $a=0.06$ fm and 0.04 fm. We reconstruct the $x$-dependent PDF, as well as infer the first few even moments of the PDF using leading-twist 1-loop perturbative matching framework. Our analyses use both RI-MOM and ratio-based schemes to renormalize the equal-time bi-local quark-bilinear matrix elements of pions boosted up to 2.4 GeV momenta. We use various model-independent and model-dependent analyses to infer the large-$x$ behavior of the valence PDF. We also present technical studies on lattice spacing and higher-twist corrections present in the boosted pion matrix elements.

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