Role of anomalous chromomagnetic interaction in Pomeron and Odderon structures and in gluon distribution

TL;DR

This paper investigates how nonperturbative quark-gluon chromomagnetic interactions influence high-energy scattering processes, revealing their dominant role in Pomeron coupling and gluon distributions, and proposing a spin-flip mechanism for the Odderon.

Contribution

It introduces a novel estimation of nonperturbative chromomagnetic effects within the instanton model, highlighting their significance in Pomeron and Odderon structures.

Findings

Chromomagnetic interactions dominate Pomeron coupling at small virtualities.

Nonperturbative effects significantly impact gluon distributions in light hadrons.

The Odderon is linked to spin-flip components from three-gluon exchange.

Abstract

We calculate the contribution arising from nonperturbative quark-gluon chromomagnetic interaction to the high energy total quark-quark cross section and to gluon distributions in nucleon. The estimation obtained within the instanton model of QCD vacuum leads to the conclusion that this type of interaction gives the dominating contribution to the Pomeron coupling with the light quarks and to gluon distribution in light hadrons at small virtualities of quarks and gluons. We argue that the Odderon, which is the $P=C=-1$ partner of Pomeron, is governed by the spin-flip component related to nonperturbative three-gluon exchange induced by anomalous quark-gluon chromomagnetic interaction.