Dijet azimuthal decorrelations at the LHC in the parton Reggeization approach

TL;DR

This paper investigates dijet azimuthal decorrelations at the LHC using the parton Reggeization approach, successfully matching experimental data through high-energy factorization and Reggeon interactions.

Contribution

It introduces a novel application of the parton Reggeization approach to describe azimuthal decorrelations in dijet production at high energies.

Findings

Good agreement with ATLAS and CMS measurements

Reggeon-Reggeon-Particle-Particle scattering dominates decorrelations

High-energy factorization effectively models the data

Abstract

We study inclusive dijet azimuthal decorrelations in proton-proton collisions at the CERN LHC invoking the hypothesis of parton Reggeization in t-channel exchanges at high energies. In the parton Reggeization approach, the main contribution to the azimuthal angle difference between the two most energetic jets is due to the Reggeon-Reggeon-Particle-Particle scattering, when the fusion of two Reggeized gluons into a pair of Yang-Mills gluons dominates. Using a high-energy factorization scheme with the Kimber-Martin-Ryskin unintegrated parton distribution functions and the Fadin-Lipatov effective vertices we obtain good agreement of our calculations with recent measurements by the ATLAS and CMS Collaborations at the CERN LHC.