Genuine twist-3 contributions to the generalized parton distributions from instantons

2002/12/31 by D. V. Kiptily, M. V. Polyakov
Physics and Astronomy · #hep-ph

paper · pdf

published as Eur.Phys.J. C37 (2004) 105-114 · 17 pages

arxiv created 2003/02/14 · arxiv updated 2009/11/30

Abstract

The genuine twist-3 quark-gluon contributions to the Generalized Parton Distributions (GPDs) are estimated in the model of the instanton vacuum. These twist-3 effects are found to be parametrically suppressed relative to the ``kinematical'' twist-3 ones due to the small packing fraction of the instanton vacuum. We derive exact sum rules for the twist-3 GPDs.

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