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

- Institution: CERN
- Department: Conferences
- Speaker: Heikki Mäntysaari
- Year: 2021
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3017946)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

Particle production at forward rapidities in proton-nucleus collisions provides access to the target structure at very small momentum fraction x, where non-linear QCD dynamics is expect to play an important role. Recently, the CASTOR calorimeter at CMS \[1\], covering pseudodapidity region -6.6 < eta < -5.2, has released first jet spectra measurements in proton-lead collisions, probing nuclear structure down to Bjorken-x values of the order of 10^(-6).

In this talk, based on Ref\[2\] we investigate the forward-jet energy spectrum within the Color Glass Condensate framework, focusing 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 multiparton interactions need to be included on top on non-linear QCD dynamics. We predict a significant nuclear suppression — reaching down to 50% at the lowest considered jet energies E_jet∼500 GeV.

References: \[1\] CMS Collaboration, JHEP 05 (2019) 043, arXiv:1812.01691 \[hep-ex\] \[2\] H. Mäntysaari, H. Paukkunen, Phys.Rev. D100 (2019) no.11, 114029, arXiv:1910.13116.

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## Lectures

1. [Saturation and forward jets in proton-lead collisions at the LHC](https://invisiblenetwork.ai/learn/cern/3017946/7d4ee557a5da), 23 min (CERN's player)