Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-06-13
Nucl.Phys.Proc.Suppl. 51C (1996) 106-110
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, LaTeX, Talk given at the workshop "QCD and QED in Higher Order", Rheinsberg, April 21-26, 1996
Scientific paper
The twist three contributions to the $Q^2$-evolution of the spin-dependent structure function $g_2(x)$ are considered in the non-local operator product approach. Starting from the perturbative expansion of the T-product of two electromagnetic currents, we introduce the nonlocal light-cone expansion proved by Anikin and Zavialov and determine the physical relevant set of light-ray operators of twist three. Using the equations of motion we show the equivalence of these operators to the Shuryak-Vainshtein operators plus the mass operator, and we determine their evolution kernels using the light-cone gauge with the Leibbrandt-Mandelstam prescription. The result of Balitsky and Braun for the twist three evolution kernel (nonsinglet case) is confirmed.
Geyer Bodo
Muller Daniel
Robaschik Dieter
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