Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at √sNN=5.02 TeV

CMS Collaboration

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The production of jets in association with Z bosons, reconstructed via the μ+μ and e+e 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 pZT> 60 GeV/c and a recoiling jet with pjetT > 30 GeV/c. The pT imbalance xjZ = pjetT / pZT, as well as the average number of jet partners per Z, RjZ, was studied in intervals of pZT. The RjZ 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 pjetT threshold because they lose energy.
Original languageEnglish
Article number082301
Number of pages18
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 2017
Externally publishedYes


  • Collisions
  • Jet quenching
  • Jets

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