Study of Jet Quenching with Z + jet Correlations in Pb-Pb and pp Collisions at √s[subscript NN] = 5.02 TeV
Name
PhysRevLett.119.082301.pdf
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
August 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Sirunyan, A. M., et al. “Study of Jet Quenching with Z + Jet Correlations in Pb-Pb and P P Collisions √S[subscript NN] = 5.02 TeV.” Physical Review Letters, vol. 119, no. 8, Aug. 2017. © 2017 CERN, for the CMS Collaboration.
Version
Final published version
Abstract
The production of jets in association with Z bosons, reconstructed via the μ[superscript +]μ[superscript -] and e[superscript +]e[superscript -] decay channels, is studied in pp and, for the first time, in Pb-Pb collisions. Both data samples were collected by the CMS experiment at the LHC, at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The Pb-Pb collisions were analyzed in the 0%-30% centrality range. The back-to-back azimuthal alignment was studied in both pp and Pb-Pb collisions for Z bosons with transverse momentum p[superscript Z][subscript T] > 60 GeV/c and a recoiling jet with p[superscript jet][subscript T] > 30 GeV/c. The p[subscript T] imbalance x[subscript jZ]=p[superscript jet][subscript T]/p[superscript Z][subscript T], as well as the average number of jet partners per Z, R[subscript jZ], was studied in intervals of p[superscript Z][subscript T]. The R[subscript jZ] is found to be smaller in Pb-Pb than in pp collisions, which suggests that in Pb-Pb collisions a larger fraction of partons associated with the Z bosons fall below the 30 GeV/c p[superscript jet][subscript T] threshold because they lose energy.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.119.082301
