Spin-dependent twist-4 matrix elements from the instanton vacuum: Flavor-singlet and nonsinglet

Details Spin-dependent twist-4 matrix elements from the instanton vacuum: Flavor-singlet and nonsinglet Spin-dependent twist-4 matrix elements from the instanton vacuum: Flavor-singlet and nonsinglet

2001-05-17

arxiv.org/abs/hep-ph/0105173v1

Phys.Rev. D65 (2002) 054008

Physics

High Energy Physics

High Energy Physics - Phenomenology

17 pages, 4 eps figures included

Scientific paper

10.1103/PhysRevD.65.054008

We estimate the twist-4 spin-1 nucleon matrix element f_2 in an instanton-based description of the QCD vacuum. In addition to the flavor-nonsinglet we compute also the flavor-singlet matrix element, which appears in next-to-leading order of the (1/N_c)-expansion. The corresponding twist-3 spin-2 matrix elements d_2 are suppressed in the packing fraction of the instanton medium, (\bar \rho)/(\bar R) << 1. We use our results to estimate the leading (1/Q^2) power corrections to the first moment of the proton and neutron spin structure functions G_1, as well as the intrinsic charm contribution to the nucleon spin.

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