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

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

doi:10.1103/PhysRevD.66.034506

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

Journal Article · Tue Jan 01 04:00:00 EST 2002

DOI:https://doi.org/10.1103/PhysRevD.66.034506· OSTI ID:790983

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 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.

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Research Organization:: Thomas Jefferson National Accelerator Facility, Newport News, VA (US)

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: FC02-94ER40818; AC05-84ER40150; FG02-91ER40676

OSTI ID:: 790983

Report Number(s):: JLAB-THY-02-06; DOE/ER/40150-1987; MIT-CTP-3219

Country of Publication:: United States

Language:: English

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