Reggeon-gluon vertices with Ward identities

TL;DR

This paper investigates Ward identities for reggeons within an effective action framework in QCD, revealing the necessity of additional contributions to standard reggeon diagrams and applying these findings to specific vertex processes.

Contribution

It introduces new contributions to reggeon diagrams required by Ward identities, enhancing the understanding of reggeon interactions in QCD.

Findings

Additional diagrams are necessary for RR→RP and RR→RRP vertices.

Ward identities impose constraints leading to new diagrammatic contributions.

The approach refines the effective action method for reggeon interactions.

Abstract

Ward identities for reggeons are studied in the framework of effective action approach to the QCD in Regge kinematics. It is shown that they require introduction of new contributions not present in the reggeon diagrams initially. Application to vertices RR$\to$RP and RR$\to$RRP are considered and diagrams which have to be added to the QCD ones are found.