Zusammenfassung
We perform an extensive study of the scale dependence of flavor-singlet contributions to the structure function g(2)(x, Q(2)) in polarized deep-inelastic scattering. We find that the mixing between quark-antiquark-gluon and three-gluon twist-3 operators only involves the three-gluon operator with the lowest anomalous dimension and is weak in other cases. This means, effectively, that only those ...
Zusammenfassung
We perform an extensive study of the scale dependence of flavor-singlet contributions to the structure function g(2)(x, Q(2)) in polarized deep-inelastic scattering. We find that the mixing between quark-antiquark-gluon and three-gluon twist-3 operators only involves the three-gluon operator with the lowest anomalous dimension and is weak in other cases. This means, effectively, that only those three-gluon operators with the lowest anomalous dimension for each moment are important, and allows to formulate a simple two-component parton-like description of ga(x, Q(2)) in analogy with the conventional description of twist-2 parton distributions. The similar simplification was observed earlier for the nonsinglet distributions, although the reason is in our case different. (C) 2001 Elsevier Science B.V. All rights reserved.
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