arXiv:2510.26425·v2·High Energy Physics — Lattice
Unpolarized gluon PDF of the nucleon from lattice QCD at physical point in the continuum limit
Chen Chen🇨🇳 · Chunhua Zeng🇨🇳 · Hongxin Dong🇨🇳 · Liuming Liu🇨🇳 · Xiaomin Shen🇨🇳 · Peng Sun🇨🇳 · Xiaonu Xiong🇨🇳 · Yi-Bo Yang🇨🇳 · Fei Yao🇺🇸 · Jian-Hui Zhang🇨🇳 · Shiyi Zhong🇨🇳
Abstract
We report a state-of-the-art lattice QCD calculation of the nucleon unpolarized gluon parton distribution function employing large-momentum effective theory. The calculation is carried out on the 2+1 flavor CLQCD ensembles with five lattice spacings a={0.105,0.0897,0.0775, 0.0688, 0.0519} fm and various pion masses ranging from 136 MeV to 317 MeV, covering nulceon momenta up to 3 GeV. Distillation technique is applied to improve the signal of two-point correlators. We then apply the state-of-the-art hybrid renormalization and one-loop perturbative matching, and extrapolate the result to the continuum limit, infinite momentum limit and physical pion mass.