On the collision of two projectiles on two targets in the BFKL approach

TL;DR

This paper investigates high-energy nucleon-nucleon collisions using the BFKL approach, highlighting the potential significance of BKP states with four reggeized gluons in deuteron-deuteron scattering.

Contribution

It introduces the role of BKP states with four reggeized gluons in the BFKL framework, suggesting their possible leading contribution in certain scattering processes.

Findings

BKP states contribute significantly to deuteron-deuteron scattering

Intermediate BKP states may be experimentally observable

Diagrams with colour redistribution are analyzed

Abstract

High-energy collisions of two nucleons on two nucleons are studied in the BFKL approach in the leading approximation in $\alpha_sN_c$. Diagrams with redistribution of colour are considered. It is found that intermediate BKP states consisting of 4 reggeized gluons give a contribution which may be leading in deuteron-deuteron scattering and thus experimentally observable.