Genuine twist-3 contributions to the generalized parton distributionsfrom instantons

D. V. Kiptily; M. V. Polyakov

doi:10.1140/epjc/s2004-01957-3

EPJ

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2022 Impact factor 4.4

Particles and Fields

Eur. Phys. J. C (2004) 37: 105-114
https://doi.org/10.1140/epjc/s2004-01957-3

theoretical physics

Genuine twist-3 contributions to the generalized parton distributionsfrom instantons

D. V. Kiptily¹ and M. V. Polyakov¹^,2

¹ Institut für Theoretische Physik II, Ruhr-Universität Bochum, 44780, Bochum, Germany
² Petersburg Nuclear Physics Institute, 188350, Gatchina, St. Petersburg, Russia

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 derived exact sum rules for the twist-3 GPDs.