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Scientific article
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English

Comparison of inclusive and photon-tagged jet suppression in 5.02 TeV Pb+Pb collisions with ATLAS

ContributorsATLAS Collaboration
Published inPhysics letters. B, vol. 846, 138154
Publication date2023
Abstract

Parton energy loss in the quark–gluon plasma (QGP) is studied with a measurement of photon-tagged jet production in 1.7 nb−1 of Pb+Pb data and 260 pb−1 of pp data, both at sNN=5.02 TeV, with the ATLAS detector. The process pp →γ+jet+X and its analogue in Pb+Pb collisions is measured in events containing an isolated photon with transverse momentum (pT) above 50 GeV and reported as a function of jet pT. This selection results in a sample of jets with a steeply falling pT distribution that are mostly initiated by the showering of quarks. The pp and Pb+Pb measurements are used to report the nuclear modification factor, RAA, and the fractional energy loss, Sloss, for photon-tagged jets. In addition, the results are compared with the analogous ones for inclusive jets, which have a significantly smaller quark-initiated fraction. The RAA and Sloss values are found to be significantly different between those for photon-tagged jets and inclusive jets, demonstrating that energy loss in the QGP is sensitive to the colour-charge of the initiating parton. The results are also compared with a variety of theoretical models of colour-charge-dependent energy loss.

eng
Keywords
  • Quark gluon: plasma
  • Jet: production
  • Jet: suppression
  • Parton: energy loss
  • ATLAS
  • TeV
  • GeV
  • Lead
  • CERN LHC Coll
  • Photon: production
  • Brookhaven RHIC Coll
  • Transverse momentum
  • Nucleon
  • PHENIX
  • Hadron
  • Monte Carlo
  • Glauber
  • Numerical calculations
  • Quark
  • Nucleus
  • Fractional
Citation (ISO format)
ATLAS Collaboration. Comparison of inclusive and photon-tagged jet suppression in 5.02 TeV Pb+Pb collisions with ATLAS. In: Physics letters. B, 2023, vol. 846, p. 138154. doi: 10.1016/j.physletb.2023.138154
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ISSN of the journal0370-2693
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