Dijet transverse momentum imbalance, fragmentation functions and jet-track correlations in PbPb collisions at sqrt(sNN) = 2.76 TeV with CMS

TL;DR

This study investigates jet quenching and fragmentation in PbPb collisions at 2.76 TeV, revealing that high-pT jet fragmentation functions are similar to pp collisions and quenching persists at very high jet energies.

Contribution

It provides new insights into jet quenching effects and fragmentation functions in heavy-ion collisions at unprecedented energies.

Findings

Fragmentation functions are similar in PbPb and pp collisions for pT > 4 GeV/c.

Jet quenching persists up to jet pT > 300 GeV/c.

Quenching effects are observed across a wide range of jet energies.

Abstract

Dijets in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV are studied with the CMS detector at the LHC. It is shown that the fragmentation functions of jets into charged particle tracks with transverse momenta pT > 4 GeV/c in PbPb collisions are similar to those in pp collisions, for both the leading and subleading jets. In addition, study of high statistics PbPb data acquired in 2011 shows that the quenching phenomenon exists up to highest jet pT values in excess of 300 GeV/c.