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Twist-4 effects in electroproduction: Canonical operators and coefficient functions
Phys. Rev. D 26, 49 – Published 1 July, 1982
DOI: https://doi.org/10.1103/PhysRevD.26.49
Abstract
The interpretation of observed scaling violations in leptoproduction is complicated by the possible presence of significant higher-twist effects. We refine the machinery of the operator-product expansion sufficiently for a study of twist-4 effects. In particular, we introduce and review the advantages of a special, "canonical" basis. We demonstrate that the canonical basis is adequate for the necessary twist-4 perturbative calculations, and calculate the operators' tree-level coefficient functions in electroproduction. Our results establish a framework within which careful analysis of more accurate data can provide information regarding correlations among the constituents of the proton.
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