Gluon contribution to the structure function g_2(x,Q^2)

Details Gluon contribution to the structure function g_2(x,Q^2) Gluon contribution to the structure function g_2(x,Q^2)

2000-10-12

arxiv.org/abs/hep-ph/0010128v3

Nucl.Phys. B597 (2001) 370-398

Physics

High Energy Physics

High Energy Physics - Phenomenology

26 pages, Latex style, 4 figures (two references added, a few typos corrected)

Scientific paper

10.1016/S0550-3213(00)00754-9

We calculate the one-loop twist-3 gluon contribution to the flavor-singlet structure function g_2(x,Q^2) in polarized deep-inelastic scattering and find that it is dominated by the contribution of the three-gluon operator with the lowest anomalous dimension (for each moment N). The similar property was observed earlier for the nonsinglet distributions, although the reason is in our case different. The result is encouraging and suggests a simple evolution pattern of g_2(x,Q^2) in analogy with the conventional description of twist-2 parton distributions.

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