We present the next-to-next-to-leading order (NNLO) calculation of quark quasiparton distribution functions (PDFs) in the large momentum effective theory. The nontrivial factorization at this order is established explicitly and the full analytic matching coefficients between the quasidistribution and the light-cone distribution are derived. We demonstrate that the NNLO numerical contributions can improve the behavior of the extracted PDFs sizably. With the unprecedented precision study of nucleon tomography at the planned electron-ion collider, high precision lattice QCD simulations with our NNLO results implemented will enable to test the QCD theory and more precise results on the PDFs of nucleons will be obtained.

中文翻译：

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准Parton分布函数的次于先导顺序计算

在大动量有效理论中，我们介绍了夸克拟部分分布函数（PDF）的下一个到下一个领先顺序（NNLO）计算。显式地建立了这个顺序的非平凡分解，并推导了准分布和光锥分布之间的完整解析匹配系数。我们证明，NNLO数值贡献可以显着改善提取的PDF的行为。通过在计划的电子离子对撞机上进行核子层析成像的空前的精确性研究，利用我们的NNLO结果实现的高精度晶格QCD模拟将能够检验QCD理论，并且将获得关于核子PDF的更精确结果。