Comparison of Fragmentation Functions for Jets Dominated by Light Quarks and Gluons from pp and Pb+Pb Collisions in ATLAS

Research output: Contribution to journalArticle

Abstract

Charged-particle fragmentation functions for jets azimuthally balanced by a high-transverse-momentum, prompt, isolated photon are measured in 25 pb-1 of pp and 0.49 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 measurements are compared to predictions of Monte Carlo generators and to measurements of inclusively selected jets. In pp collisions, a different jet fragmentation function in photon-tagged events from that in inclusive jet events arises from the difference in fragmentation between light quarks and gluons. The ratios of the fragmentation functions in Pb+Pb events to that in pp events are used to explore the parton color-charge dependence of jet quenching in the hot medium. In relatively peripheral collisions, fragmentation functions exhibit a similar modification pattern for photon-tagged and inclusive jets. However, photon-tagged jets are observed to have larger modifications than inclusive jets in central Pb+Pb events. © 2019 CERN.

Details

Authors
Organisations
External organisations
  • CERN
  • Mohamed Premier University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Subatomic Physics

Keywords

  • Charged particles, Colliding beam accelerators, Photons, Tellurium compounds, Charge dependence, Fragmentation functions, Isolated photons, Jet fragmentation, Large Hadron Collider, Monte Carlo generator, Particle fragmentation, Transverse momenta, Lead compounds
Original languageEnglish
Article number042001
JournalPhysical Review Letters
Volume123
Issue number4
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes