Resummation effects in forward production of Z0+jet at LHC

TL;DR

This paper investigates the impact of resummation effects on forward Z0+jet production at the LHC, emphasizing the importance of hard scale dependence in unintegrated gluon distributions for accurate predictions.

Contribution

It introduces a detailed analysis of resummation effects in forward Z0+jet production using hybrid High Energy Factorization, highlighting the role of hard scale dependence in unintegrated gluon distributions.

Findings

Hard scale dependence is crucial for azimuthal decorrelation predictions.

Inclusion of subleading BFKL effects improves data agreement.

Resummation of small x and Sudakov logarithms enhances theoretical accuracy.

Abstract

We calculate several differential cross sections for Z0 and high-pT jet production in the forward rapidity region at the LHC using the hybrid High Energy Factorization. We test various unintegrated gluon distributions involving subleading BFKL effects (such as kinematic constraint, running strong coupling and DGLAP correction) and compare the results with experimental data obtained by the LHCb experiment. We find that the hard scale dependence of unintegrated gluon distributions, which effectively resums the Sudakov-type logarithms on the top of the resummation of the small x logarithms, is essential to describe the normalized azimuthal decorrelations between the Z0-boson and the jet.