Medium-Induced Modification of Z -Tagged Charged Particle Yields in Pb+Pb Collisions at 5.02 TeV with the ATLAS Detector

Research output: Contribution to journalArticle


The yield of charged particles opposite to a Z boson with large transverse momentum (pT) is measured in 260 pb-1 of pp and 1.7 nb-1 of Pb+Pb collision data at 5.02 TeV per nucleon pair recorded with the ATLAS detector at the Large Hadron Collider. The Z boson tag is used to select hard-scattered partons with specific kinematics, and to observe how their showers are modified as they propagate through the quark-gluon plasma created in Pb+Pb collisions. Compared with pp collisions, charged-particle yields in Pb+Pb collisions show significant modifications as a function of charged-particle pT in a way that depends on event centrality and Z boson pT. The data are compared with a variety of theoretical calculations and provide new information about the medium-induced energy loss of partons in a pT regime difficult to measure through other channels. © 2021 CERN.


External organisations
  • CERN
  • Aix-Marseille University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics


  • Bosons, Charged particles, Colliding beam accelerators, Energy dissipation, ATLAS detectors, Induced energy, Large Hadron Collider, Quark-gluon plasma, Theoretical calculations, Transverse momenta, Z Bosons, Lead compounds
Original languageEnglish
Article number072301
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 2021
Publication categoryResearch