Light-Cone Parton Distribution Functions from Lattice QCD

Alexandrou, Constantia; Cichy, Krzysztof; Constantinou, Martha; Jansen, Karl; Scapellato, Aurora; Steffens, Fernanda

doi:10.1103/PhysRevLett.121.112001

Title: Light-Cone Parton Distribution Functions from Lattice QCD

Journal Article · Sat Sep 01 00:00:00 EDT 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.121.112001· OSTI ID:1469749

Alexandrou, Constantia; Cichy, Krzysztof; Constantinou, Martha; Jansen, Karl; Scapellato, Aurora; Steffens, Fernanda

We extract parton distribution functions (PDFs) of the nucleon from lattice QCD using an ensemble of gauge field configurations simulated with light quark masses fixed to their physical values. Theoretical and algorithmic improvements that allow such a calculation include momentum smearing to reach large nucleon boosts with reduced statistical errors, nonperturbative renormalization, target mass corrections, and a novel modified matching of lattice QCD results to connect to what is extracted from experimental measurements. We give results on the unpolarized and helicity PDFs in the modified minimal subtraction scheme at a scale of 2 GeV and reproduce the main features of the experimentally determined quantities, showing an overlap for a range of Bjorken-x values. This first direct nonperturbative evaluation opens a most promising path to compute PDFs in an ab initio way on the lattice and provides a framework for investigating also a wider class of similar quantities, which require the evaluation of hadronic matrix elements of nonlocal operators.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1469749

Alternate ID(s):: OSTI ID: 1565693

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 121 Journal Issue: 11; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 110 works

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