Complementarity of experimental and lattice QCD data on pion parton distributions

We extract pion parton distribution functions (PDFs) in a Monte Carlo global QCD analysis of experimental data together with reduced Ioffe time pseudo-distributions and matrix elements of current-current correlators generated from lattice QCD. By including both experimental and lattice QCD data, our...

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Bibliographic Details
Published in:Physical review. D 2022-06, Vol.105 (11), Article 114051
Main Authors: Barry, P. C., Egerer, C., Karpie, J., Melnitchouk, W., Monahan, C., Orginos, K., Qiu, Jian-Wei, Richards, D., Sato, N., Sufian, R. S., Zafeiropoulos, S.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
High Energy Physics - Lattice
High Energy Physics - Phenomenology
Nuclear Theory
Physics
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Summary:We extract pion parton distribution functions (PDFs) in a Monte Carlo global QCD analysis of experimental data together with reduced Ioffe time pseudo-distributions and matrix elements of current-current correlators generated from lattice QCD. By including both experimental and lattice QCD data, our analysis rigorously quantifies both the uncertainties of the pion PDFs and systematic effects intrinsic to the lattice QCD observables. The reduced Ioffe time pseudo-distributions significantly decrease the uncertainties on the PDFs, while the current-current correlators are limited by the systematic effects associated with the lattice. Consistent with recent phenomenological determinations, the behavior of the valence quark distribution of the pion at large momentum fraction is found to be ∼ ( 1-x ) βeff with βeff≈1.0–1.2 .
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.105.114051