Unpolarized proton PDF at NNLO from lattice QCD with physical quark masses

Unpolarized proton PDF at NNLO from lattice QCD with physical quark masses
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来自具有物理夸克质量的晶格 QCD 的 NNLO 处的非偏振质子 PDF

DOI:
10.1103/physrevd.107.074509
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发表时间:
2023
期刊:
影响因子:
5
通讯作者:
Zhao, Yong
Zhao, Yong
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gao, Xiang;Hanlon, Andrew D.;Holligan, Jack;Karthik, Nikhil;Mukherjee, Swagato;Petreczky, Peter;Syritsyn, Sergey;Zhao, Yong

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利用微扰匹配的次次前导(NNLO)方法,计算了质子的非极化等矢量夸克部分子分布函数(PDF)的晶格QCD。计算是使用单个规范组态进行的,这些规范组态是由高度改进的交错夸克产生的,具有物理质量和晶格间距。我们在这些规范配置上使用一次超三次涂抹迭代,然后将得到的涂抹配置用于后续计算的所有方面。对于价夸克,我们使用具有物理夸克质量的威尔逊-三叶草作用量。我们考虑了几种在PDF上提取信息的方法。我们首先利用主扭算符乘积展开近似提取最低的四个Mellin矩。然后,我们通过伪PDF方法中的深度神经网络以及使用混合重整化方案的大动量有效理论框架来确定PDF的相关性。这是第一次在物理点上直接应用核子的NNLO匹配系数。
We present a lattice QCD calculation of the unpolarized isovector quark parton distribution function (PDF) of the proton utilizing a perturbative matching at next-to-next-to-leading-order (NNLO). The calculations are carried out using a single ensemble of gauge configurations generated withhighly-improved staggered quarks with physical masses and a lattice spacing of. We use one iteration of hypercubic smearing on these gauge configurations, and the resulting smeared configurations are then used for all aspects of the subsequent calculation. For the valence quarks, we use the Wilson-clover action with physical quark masses. We consider several methods for extracting information on the PDF. We first extract the lowest four Mellin moments using the leading-twist operator product expansion approximation. Then, we determine thedependence of the PDF through a deep neural network within the pseudo-PDF approach and additionally through the framework of large-momentum effective theory utilizing a hybrid renormalization scheme. This is the first application of the NNLO matching coefficients for the nucleon directly at the physical point.
重新审视夸克素相关器矩的强耦合常数
DOI: --
发表时间: 2020
期刊: The European Physical Journal C
影响因子: --
作者:
P. Petreczky;J. Weber
通讯作者: J. Weber