Dijet azimuthal correlations in p-p and p-Pb collisions at forward LHC calorimeters

TL;DR

This paper presents advanced theoretical calculations for forward dijet production in proton-proton and proton-lead collisions at the LHC, highlighting their potential to probe saturation effects in nuclear matter.

Contribution

It introduces a state-of-the-art computation using the ITMD formalism with full resummation and nonperturbative corrections for forward dijets at the LHC.

Findings

Forward dijets in p-Pb collisions effectively probe saturation effects.

Sudakov resummation does not diminish the observed suppression of cross sections.

The approach covers rapidity domains relevant to ATLAS and ALICE detectors.

Abstract

We present a state-of-the-art computation for the production of forward dijets in proton-proton and proton-lead collisions at the LHC, in rapidity domains covered by the ATLAS calorimeter and the planned FoCal extension of the ALICE detector. We use the small-x improved TMD (ITMD) formalism, together with collinearly improved TMD gluon distributions and full b-space Sudakov resummation, and discuss nonperturbative corrections due to hadronization and showers using the Pythia event generator. We observe that forward dijets in proton-nucleus collisions at moderately low pT are excellent probes of saturation effects, as the Sudakov resummation does not alter the suppression of the cross section.