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Title: Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD

Abstract

Moments of the quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD. Calculations of proton matrix elements of operators corresponding to these moments through the operator product expansion have been performed on the 16{sup 3} x 32 lattices for Wilson fermions at Beta=5.6 using configurations from the SESAM collaboration and at Beta = 5.5 using configurations from SCRI. One-loop perturbative renormalization corrections are included. At quark masses accessible in present calculations, there is no statistically significant difference between quenched and full QCD results, indicating that the contributions of quark-antiquark excitations from the Dirac Sea are small. Close agreement between calculations with cooled configurations containing essentially only instantons and the full gluon configurations indicates that quark zero modes associated with instantons play a dominant role. Naive linear extrapolation of the full QCD calculation to the physical pion mass yields results inconsistent with experiment. Extrapolation to the chiral limit including the physics of the pion cloud can resolve this discrepancy and the requirements for a definitive chiral extrapolation are described.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
790983
Report Number(s):
JLAB-THY-02-06; DOE/ER/40150-1987; MIT-CTP-3219
TRN: US0200573
DOE Contract Number:  
FC02-94ER40818; AC05-84ER40150; FG02-91ER40676; FG02-91ER41022
Resource Type:
Journal Article
Resource Relation:
Other Information: No journal information given for this preprint; PBD: 1 Jan 2002
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXTRAPOLATION; FERMIONS; INSTANTONS; LIGHT CONE; NUCLEONS; OPERATOR PRODUCT EXPANSION; PIONS; QUANTUM CHROMODYNAMICS; QUARKS; HELICITY; CHIRALITY

Citation Formats

Dolgov, D, Brower, R, Capitani, S, Dreher, P, Negele, J W, Pochinsky, A, Renner, D B, Eicker, N, Lippert, Th, Schilling, K, Edwards, R G, and Heller, U M. Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD. United States: N. p., 2002. Web. doi:10.1103/PhysRevD.66.034506.
Dolgov, D, Brower, R, Capitani, S, Dreher, P, Negele, J W, Pochinsky, A, Renner, D B, Eicker, N, Lippert, Th, Schilling, K, Edwards, R G, & Heller, U M. Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD. United States. https://doi.org/10.1103/PhysRevD.66.034506
Dolgov, D, Brower, R, Capitani, S, Dreher, P, Negele, J W, Pochinsky, A, Renner, D B, Eicker, N, Lippert, Th, Schilling, K, Edwards, R G, and Heller, U M. Tue . "Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD". United States. https://doi.org/10.1103/PhysRevD.66.034506. https://www.osti.gov/servlets/purl/790983.
@article{osti_790983,
title = {Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD},
author = {Dolgov, D and Brower, R and Capitani, S and Dreher, P and Negele, J W and Pochinsky, A and Renner, D B and Eicker, N and Lippert, Th and Schilling, K and Edwards, R G and Heller, U M},
abstractNote = {Moments of the quark density, helicity, and transversity distributions are calculated in unquenched lattice QCD. Calculations of proton matrix elements of operators corresponding to these moments through the operator product expansion have been performed on the 16{sup 3} x 32 lattices for Wilson fermions at Beta=5.6 using configurations from the SESAM collaboration and at Beta = 5.5 using configurations from SCRI. One-loop perturbative renormalization corrections are included. At quark masses accessible in present calculations, there is no statistically significant difference between quenched and full QCD results, indicating that the contributions of quark-antiquark excitations from the Dirac Sea are small. Close agreement between calculations with cooled configurations containing essentially only instantons and the full gluon configurations indicates that quark zero modes associated with instantons play a dominant role. Naive linear extrapolation of the full QCD calculation to the physical pion mass yields results inconsistent with experiment. Extrapolation to the chiral limit including the physics of the pion cloud can resolve this discrepancy and the requirements for a definitive chiral extrapolation are described.},
doi = {10.1103/PhysRevD.66.034506},
url = {https://www.osti.gov/biblio/790983}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {1}
}

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