Quark contribution to the gluon Regge trajectory at NLO from the high energy effective action

TL;DR

This paper calculates the quark contributions to the gluon Regge trajectory at next-to-leading order using Lipatov's high energy effective action, confirming previous results and validating the regularization method.

Contribution

It provides the first two-loop calculation of quark contributions to the gluon Regge trajectory within the effective action framework, demonstrating its effectiveness.

Findings

Results agree with previous literature

Validates the regularization procedure for divergencies

Confirms the usefulness of the high energy effective action

Abstract

The two loop (NLO) diagrams with quark content contributing to the gluon Regge trajectory are computed within the framework of Lipatov's effective action for QCD, using the regularization procedure for longitudinal divergencies recently proposed by two of us in http://arXiv.org/abs/arXiv:1110.6741. Perfect agreement with previous results in the literature is found, providing a robust check of the regularization prescription and showing that the high energy effective action is a very useful computational tool in the quasi-multi-Regge limit.