Jet momentum dependence of jet quenching in PbPb collisions at sqrt(sNN)=2.76 TeV

TL;DR

This study investigates how jet quenching affects dijet momentum balance and angular correlations in PbPb collisions at 2.76 TeV, revealing significant imbalance in central collisions due to medium-induced energy loss.

Contribution

It provides the first detailed measurement of dijet momentum imbalance and angular correlations as a function of collision centrality and jet transverse momentum in PbPb collisions at this energy.

Findings

Good agreement with pp data in peripheral collisions

Strong jet momentum imbalance in central collisions

Imbalance persists at high jet transverse momenta

Abstract

Dijet production in PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV is studied with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 150 inverse microbarns is analyzed. Jets are reconstructed using combined information from tracking and calorimetry. The dijet momentum balance and angular correlations are studied as a function of collision centrality and leading jet transverse momentum. For the most peripheral PbPb collisions, good agreement of the dijet momentum balance distributions with pp data and reference calculations at the same collision energy is found, while more central collisions show a strong imbalance of leading and subleading jet transverse momenta attributed to the jet-quenching effect. The dijet momentum imbalance in central collisions is found to persist for leading jet transverse momenta up to the highest values studied.