Two-Loop Gluon Regge Trajectory from Lipatov's Effective Action

TL;DR

This paper uses Lipatov's effective action to compute the two-loop gluon Regge trajectory, advancing the understanding of high-energy QCD corrections beyond leading order.

Contribution

It introduces a regularisation and subtraction method enabling consistent two-loop calculations within Lipatov's formalism.

Findings

Successful computation of the two-loop gluon Regge trajectory.

Validation of the regularisation/subtraction prescription.

Enhanced precision in high-energy QCD predictions.

Abstract

Lipatov's high-energy effective action is a useful tool for computations in the Regge limit beyond leading order. Recently, a regularisation/subtraction prescription has been proposed that allows to apply this formalism to calculate next-to-leading order corrections in a consistent way. We illustrate this procedure with the computation of the gluon Regge trajectory at two loops.