Unpolarized proton PDF at NNLO from lattice QCD with physical quark masses
Unpolarized proton PDF at NNLO from lattice QCD with physical quark masses
复制标题
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
影响因子:
5
通讯作者:
Zhao, Yong
中科院分区:
文献类型:
--
作者:
Gao, Xiang;Hanlon, Andrew D.;Holligan, Jack;Karthik, Nikhil;Mukherjee, Swagato;Petreczky, Peter;Syritsyn, Sergey;Zhao, Yong
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.
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