Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at √s[NN] = 5.02 TeV
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
D'Alfonso, Mariarosaria
Date Issued
August 2018
Journal
Physics Letters B
Publisher
Elsevier
Citation
Sirunyan, A. M., et al. “Study of Jet Quenching with Isolated-Photon+jet Correlations in PbPb and Pp Collisions at √s[subscript NN] = 5.02 TeV.” Physics Letters B, vol. 785, Oct. 2018, pp. 14–39. © 2018 The Authors
Version
Final published version
Abstract
Measurements of azimuthal angle and transverse momentum (p[subscript T]) correlations of isolated photons and associated jets are reported for pp and PbPb collisions at √s[subscript NN] = 5.02 TeV. The data were recorded with the CMS detector at the CERN LHC. For events containing a leading isolated photon with p[subscript T][superscript γ] > 40 GeV/c and an associated jet with p[subscript T][superscript jet]>30 GeV/c, the photon+jet azimuthal correlation and p[subscript T] imbalance in PbPb collisions are studied as functions of collision centrality and p[subscript T][superscript γ]. The results are compared to pp reference data collected at the same collision energy and to predictions from several theoretical models for parton energy loss. No evidence of broadening of the photon+jet azimuthal correlations is observed, while the ratio p[subscript T][superscript jet]/p[subscript T][superscript γ] decreases significantly for PbPb data relative to the pp reference. All models considered agree within uncertainties with the data. The number of associated jets per photon with p[subscript T][superscript γ] > 80 GeV/c is observed to be shifted towards lower p[subscript T][superscript jet] values in central PbPb collisions compared to pp collisions. Keywords: CMS, Heavy ion, Physics, Photon, Jet, Jet quenching
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2018.07.061
