Jet-jet and hadron-jet correlations in hadro- and electro-production

TL;DR

This paper analyzes jet-jet and hadron-jet correlations in high-energy collisions using next-to-leading order perturbative QCD, highlighting kinematic effects and differences between hadro- and electro-production, with no current experimental data for validation.

Contribution

It provides a detailed theoretical study of jet and particle correlations in different production processes, emphasizing the impact of kinematic constraints and the differences between collision types.

Findings

Slightly too strong azimuthal correlations at large rapidity gaps in jet-jet studies.

Strong kinematic constraints affect forward particle-jet correlations, especially at small gaps.

Decorrelation is more pronounced in electroproduction than in hadron-hadron collisions.

Abstract

We discuss, in the framework of perturbative QCD at next to leading order, two related observables which are usually considered to provide tests of the BFKL dynamics : jet-jet correlations at Tevatron energies and forward particle-jet correlations at HERA. In the first case we study the rapidity gap dependence of the azimuthal correlations and find slightly too strong correlations at large gap. In the second case we discuss the cross section as well as the azimuthal correlations over a rapidity gap range of 5 units. We find that the requirement of a forward particle imposes strong kinematical constraints which distort the distributions, notably at small rapidity gaps. We also show that the decorrelation is stronger in electroproduction than in hadron-hadron collisions. Unfortunately no data are yet available for comparison.