Nucleon matrix elements of higher-twist operators from the instanton vacuum

Details Nucleon matrix elements of higher-twist operators from the instanton vacuum Nucleon matrix elements of higher-twist operators from the instanton vacuum

1997-07-30

arxiv.org/abs/hep-ph/9707515v1

Nucl.Phys. B510 (1998) 327-364

Physics

High Energy Physics

High Energy Physics - Phenomenology

40 pages, LaTeX, 2 Figures included using epsf

Scientific paper

10.1016/S0550-3213(98)00638-5

We compute the nucleon matrix elements of QCD operators of twist 3 and 4 in the instanton vacuum. We consider the operators determining 1/Q^2-power corrections to the Bjorken, Ellis-Jaffe and Gross-Llewellyn-Smith sum rules. The nucleon is described as a soliton of the effective chiral theory derived from instantons in the 1/N_c-expansion. QCD operators involving the gluon field are systematically represented by effective operators in the effective chiral theory. We find that twist-3 matrix elements are suppressed relative to twist-4 by a power of the packing fraction of the instanton medium. Numerical results for the spin-dependent (d^(2), f^(2)) and spin-independent twist-3 and 4 matrix elements are compared with results of other approaches and with experimental estimates of power corrections. The methods developed can be used to evaluate a wide range of matrix elements relevant to DIS.

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