Latest CMS Heavy-Ion Results on Jets

TL;DR

This paper presents recent CMS measurements of jet quenching in heavy-ion collisions, demonstrating energy loss and fragmentation differences in quark-gluon plasma, and clarifying initial state effects.

Contribution

It provides new experimental results on jet suppression and fragmentation in PbPb and pPb collisions at LHC energies, enhancing understanding of quark-gluon plasma properties.

Findings

Jets are quenched in central PbPb compared to pp.

Jet fragmentation differs between PbPb and pp.

Suppression in pPb is not due to initial state effects.

Abstract

Jet studies provide an experimental method to explore the features of energy loss in the strongly interacting quark-gluon plasma. Recent jet results from 2.76 TeV PbPb and pp collisions measured with the CMS detector are presented. Jets in the most head-on (central) PbPb collisions are quenched in comparison to pp, and the jets fragment in different ways in the two systems. Measurements from pPb collisions at 5.02 TeV show that the jet and charged particle suppression seen in central PbPb measurements are not due to initial state nuclear effects.