Multi-Regge kinematics and azimuthal angle observables for inclusive four-jet production

TL;DR

This paper analyzes four-jet production at hadron colliders within multi-Regge kinematics, focusing on azimuthal angle correlations to identify signals of BFKL dynamics through differential cross sections.

Contribution

It introduces a detailed calculation of four-jet production using BFKL Green functions, emphasizing azimuthal correlations and central jet tagging as probes of BFKL behavior.

Findings

Azimuthal angle ratios are sensitive to BFKL dynamics.

Transverse momentum and rapidity dependences signal BFKL effects.

The approach provides a potential method to compare with experimental data.

Abstract

We evaluate differential cross sections for production of four jets in multi-Regge kinematics at a hadron collider. The main focus lies on azimuthal angle dependences. As in previous studies, the ratios of correlation functions of products of cosines of azimuthal angle differences among the tagged jets offer us the cleanest quantities to compare with experimental data. The calculations are based on the jet production from a single BFKL ladder with a convolution of three BFKL Green functions where we always have two forward/backward jets tagged in the final state. We also demand the tagging of two further jets in more central regions of the detectors with a relative separation in rapidity from each other, plus the inclusive production of an arbitrary number of mini-jets. We show that dependences on the transverse momenta and rapidity of the two central jets can be a distinct signal of the onset of BFKL dynamics.