QCD Analysis of Twist-4 Contributions to the $g_1$ Structure Functions

Details QCD Analysis of Twist-4 Contributions to the $g_1$ Structure Functions QCD Analysis of Twist-4 Contributions to the $g_1$ Structure Functions

1996-06-03

arxiv.org/abs/hep-ph/9605466v1

Z.Phys. C75 (1997) 27-33

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, LaTeX, 3 Postscript figures

Scientific paper

We analyze the twist-4 contributions to Bjorken and Ellis-Jaffe sum rules for spin-dependent structure function $g_1(x, Q^2 )$. We investigate the anomalous dimensions of the twist-4 operators which determine the logarithmic correction to the $1/Q^2$ behavior of the twist-4 contribution by evaluating off-shell Green's functions in both flavor non-singlet and singlet case. It is shown that the EOM operators play an important role to extract the anomalous dimensions of physical operators. The calculations to solve the operator mixing of higher-twist operators are given in detail.

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