Chiral extrapolation of lattice moments of proton quark distributions

We present the resolution of a long-standing discrepancy between the moments of parton distributions calculated from lattice QCD and their experimental values. We propose a simple extrapolation formula for the moments of the nonsinglet quark distribution u-d, as a function of quark mass, which embod...

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Bibliographic Details
Published in:Physical review letters 2001-10, Vol.87 (17), p.172001-172001, Article 172001
Main Authors: Detmold, W, Melnitchouk, W, Negele, J W, Renner, D B, Thomas, A W
Format: Article
Language:English
Subjects:
CHIRAL SYMMETRY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
DISTRIBUTION
ENANTIOMORPHS
EXTRAPOLATION
PARTONS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PROTONS
QUANTUM CHROMODYNAMICS
QUARKS
RESOLUTION
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Summary:We present the resolution of a long-standing discrepancy between the moments of parton distributions calculated from lattice QCD and their experimental values. We propose a simple extrapolation formula for the moments of the nonsinglet quark distribution u-d, as a function of quark mass, which embodies the general constraints imposed by the chiral symmetry of QCD. The inclusion of the leading nonanalytic behavior leads to an excellent description of both the lattice data and the experimental values of the moments.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.172001