Probing nucleon strange and charm distributions with lattice QCD

Rui Zhang; Huey-Wen Lin; Boram Yoon

doi:10.1103/PhysRevD.104.094511

Probing nucleon strange and charm distributions with lattice QCD

High Energy Physics - Lattice 2021-12-01 v1 High Energy Physics - Phenomenology Nuclear Theory

Authors: Rui Zhang , Huey-Wen Lin , Boram Yoon

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Abstract

We present the first lattice-QCD calculation of the unpolarized strange and charm parton distribution functions using large-momentum effective theory (LaMET). We use a lattice ensemble with 2+1+1 flavors of highly improved staggered quarks (HISQ) generated by MILC collaboration, with lattice spacing $a\approx 0.12$ fm and $M_\pi \approx 310$ MeV, and clover valence fermions with two valence pion masses: 310 and 690 MeV. We use momentum-smeared sources to improve the signal up to nucleon boost momentum $P_z=2.18$ GeV, and determine nonperturbative renormalization factors in RI/MOM scheme. We compare our lattice results with the matrix elements obtained from matching the PDFs from CT18NNLO and NNPDF3.1NNLO global fits. Our data support the assumptions of strange-antistrange and charm-anticharm symmetry that are commonly used in global PDF fits, and we find smaller than expected parton distribution at mid to small $x$ .

Keywords

lattice qcd parton distribution functions large-momentum effective theory strange quark charm quark nucleon

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@article{arxiv.2005.01124,
  title  = {Probing nucleon strange and charm distributions with lattice QCD},
  author = {Rui Zhang and Huey-Wen Lin and Boram Yoon},
  journal= {arXiv preprint arXiv:2005.01124},
  year   = {2021}
}

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7 pages, 10 figures

Probing nucleon strange and charm distributions with lattice QCD

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