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Type: Journal article
Title: Parton distribution functions in the pion from lattice QCD
Author: Detmold, W.
Melnitchouk, W.
Thomas, A.
Citation: Physical Review. D. Particles, Fields, Gravitation and Cosmology, 2003; 68(3):034025-1-034025-9
Publisher: American Physical Soc
Issue Date: 2003
ISSN: 1550-7998
Statement of
W. Detmold, W. Melnitchouk, A. W. Thomas
Abstract: We analyze the moments of parton distribution functions in the pion calculated in lattice QCD, paying particular attention to their chiral extrapolation. Using the lowest three nontrivial moments calculated on the lattice, we assess the accuracy with which the x dependence of both the valence and sea quark distributions in the pion can be extracted. The resulting valence quark distributions at the physical pion mass are in fair agreement with existing Drell-Yan data, but the statistical errors are such that one cannot yet confirm (or rule out) the large-x behavior expected from hadron helicity conservation in perturbative QCD. However, one can expect that the next generation of calculations in lattice QCD will allow one to extract parton distributions with a level of accuracy comparable with current experiments.
Rights: ©2003 American Physical Society
RMID: 0020030037
DOI: 10.1103/PhysRevD.68.034025
Appears in Collections:Special Research Centre for the Subatomic Structure of Matter publications

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