Saturation and forward jets in proton-lead collisions at the LHC

TL;DR

This paper studies forward-jet spectra in proton-lead collisions at the LHC using the Color Glass Condensate framework, showing compatibility with measurements and predicting significant nuclear suppression effects at low jet energies.

Contribution

It introduces saturation-model calculations for forward-jet spectra in proton-lead collisions and emphasizes the importance of multi-parton interactions for data agreement.

Findings

Saturation effects are compatible with CMS-CASTOR data.

Multi-parton interactions are essential for accurate modeling.

Predicted nuclear suppression reaches 50% at low jet energies.

Abstract

We investigate the forward-jet energy spectrum within the Color Glass Condensate framework at 5 TeV center-of-mass energy. In particular, we focus on the kinematic range covered by the CMS-CASTOR calorimeter. We show that our saturation-model calculations are compatible with the CASTOR measurements and that to optimally reproduce the data, effects of multi-parton interactions need to be included. We predict a significant nuclear suppression - reaching down to 50% at the lowest considered jet energies $E_{\rm jet} \sim 500 \, {\rm GeV}$.