Higher-twist contributions to the Structure Functions coming from 4-fermion operators
S. Capitani, M. Göckeler, R. Horsley, B. Klaus, V. Linke, P. Rakow, A. Schäfer, G. Schierholz
Abstract
We evaluate the contribution of a class of higher-twist operators to the lowest moment of the Structure Functions, by computing appropriate matrix elements of six four-fermion operators in the quenched approximation. Their perturbative renormalization constants and mixing coefficients are calculated in the 't Hooft-Veltman scheme of dimensional regularization, using codes written in the algebraic manipulation computer language FORM.
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