Study of Instanton Contributions to Moments of Nucleon Spin-Dependent Structure Functions

Abstract

Instantons are the natural mechanism in non-perturbative QCD to remove helicity from valence quarks and transfer it to gluons and quark-antiquark pairs. To understand the extent to which instantons explain the so-called "spin crisis" in the nucleon, we calculate moments of spin-dependent structure functions in quenched QCD and compare them with the results obtained with cooled configurations from which essentially all gluon contributions except instantons have been removed. Preliminary results are presented.

arXiv commentLATTICE98(matrixelement), 3 pages, 1 figure

References in corpus (8)

• Evidence for the Role of Instantons in Hadron Structure from Lattice QCD
• Polarized and Unpolarized Nucleon Structure Functions from Lattice QCD
• FLAVOR-SINGLET g_A FROM LATTICE QCD
• Proton Spin Structure from Lattice QCD
• Tensor Charge of the Nucleon in Lattice QCD
• Evidence of Instanton Effects in Hadrons from the Study of Low Eigenfunctions of the Dirac Operator
• Improved Upsilon Spectrum with Dynamical Wilson Fermions
• The Drell-Yan process and Deep Inelastic Scattering from the lattice

Cited by in corpus (7)

• The Spin Structure of the Proton
• Moments of Nucleon Light Cone Quark Distributions Calculated in Full Lattice QCD
• Determination of the Proton Spin Structure Functions for 0.05 < Q^2 < 5 GeV^2 using CLAS
• Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^2$ with CLAS and Extraction of the Neutron Contribution
• Quark scalar, axial, and pseudoscalar charges in the Schwinger-Dyson formalism
• Moments of Structure Functions in Full QCD
• Instantons and the Spin of the Nucleon