Studies of Jet Quenching in HI Collisions at CMS

TL;DR

This paper investigates jet quenching phenomena in lead-lead collisions at the LHC, revealing significant energy imbalance and redistribution in dijet events, which enhances understanding of quark-gluon plasma properties.

Contribution

First detailed CMS study of jet quenching effects in PbPb collisions at 2.76 TeV, showing energy imbalance and redistribution patterns.

Findings

Significant energy imbalance between dijets increases with collision centrality

Energy from quenched jets is redistributed to lower momentum and wider angles

Provides insights into the medium-induced modifications of jet structure

Abstract

Jet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV was studied using the CMS detector at the LHC, using a data sample corresponding to an integrated luminosity of 6.7 inverse microbarn. Dijets were reconstructed using the CMS calorimeters, and a significant energy imbalance was observed between the leading jet and the away-side jet with increasing centrality. Correlation studies of jets and tracks reveal that the energy of the away-side jet is redistributed to lower pt and wider angle outside of the jet cone.