Proton elastic impact factors for two, three, and four gluons

TL;DR

This paper presents calculations of high energy baryon scattering amplitudes in QCD, including impact factors for multiple gluons and their energy evolution, revealing new gluonic states and transition vertices.

Contribution

It introduces the impact factors for two, three, and four gluons in baryon scattering and describes a novel 3->4 gluon transition vertex in QCD.

Findings

Baryon couples to BFKL Pomeron, BKP odderon, and a new three-gluon BKP Pomeron.

Identification of a new 3->4 gluon transition vertex.

Energy evolution includes unitarity corrections.

Abstract

In this talk we report on recent calculation of high energy baryon scattering amplitudes in QCD. Elastic baryon impact factors for two, three and four gluons are presented and their energy evolution is described that incorporates unitarity corrections. We find that the baryon couples directly to the BFKL Pomeron, to the BKP odderon and to a new state, a three-gluon BKP Pomeron. The new state may decay into four gluons with a new 3 -> 4 transition vertex. This vertex defines the transition amplitude of the three-gluon BKP Pomeron state into two BFKL Pomerons.