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Probing nucleon strange and charm distributions with lattice QCD

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arxiv 2005.01124 v1 pith:P2CRZEBH submitted 2020-05-03 hep-lat hep-phnucl-th

Probing nucleon strange and charm distributions with lattice QCD

Rui Zhang , Huey-Wen Lin , Boram Yoon This is my paper
classification hep-lat hep-phnucl-th
keywords latticeapproxcharmdistributionfitsglobalnucleonparton
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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 $x$.

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Cited by 2 Pith papers

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    hep-lat 2025-04 unverdicted novelty 5.0

    Analysis of non-perturbative lattice data shows that the inverse problem in LaMET introduces significant uncertainties in parton distributions, especially from harmonics around λ=5-15, and that exact asymptotic decay ...

  2. Hadron Structure from lattice QCD in the context of the Electron-Ion Collider

    hep-lat 2026-03 unverdicted novelty 2.0

    Lattice QCD now delivers high-precision results on hadron internal structure that directly support the scientific program of the Electron-Ion Collider.