Small-$x$ dynamics in forward-central dijet decorrelations at the LHC

TL;DR

This paper models forward-central dijet decorrelations at the LHC using High Energy Factorization, successfully describing CMS data and predicting nuclear effects in p+Pb collisions with improved gluon density modeling.

Contribution

It introduces a novel approach combining BFKL and BK equations with Sudakov reweighting to accurately describe dijet decorrelations and nuclear modifications.

Findings

Good agreement with CMS dijet decorrelation data

Predictions for nuclear modification ratio R_{pA} in p+Pb collisions

Enhanced modeling of gluon densities with subleading corrections

Abstract

We provide a description, within the High Energy Factorization formalism, of central-forward dijet decorrelation data measured by the CMS experiment and the predictions for nuclear modification ratio~$R_{pA}$ in p+Pb collisions. In our study, we use the unintegrated gluon density derived from the BFKL and BK equations supplemented with subleading corrections and a hard scale dependence. The latter is introduced at the final step of the calculation by reweighting the Monte Carlo generated events using suitable Sudakov form factors, without changing the total cross section. We achieve a good description of data in the whole region of the azimuthal angle.