CMS CollaborationKarapınar, Güler2018-01-152018-01-152017Sirunyan, A.M., Tumasyan, A., Adam, W., Asilar, E., Bergauer,T., Brandstetter, J.,...CMS Collaboration (2017). Study of jet quenching with Z+jet correlations in Pb-Pb and pp collisions at s NN=5.02 TeV. Physical Review Letters, 119(8). doi:10.1103/PhysRevLett.119.0823010031-90071079-7114http://doi.org/10.1103/PhysRevLett.119.082301https://hdl.handle.net/11147/6690The 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 pTZ>60 GeV/c and a recoiling jet with pTjet>30 GeV/c. The pT imbalance xjZ=pTjet/pTZ, as well as the average number of jet partners per Z, RjZ, was studied in intervals of pTZ. 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 pTjet threshold because they lose energy.eninfo:eu-repo/semantics/openAccessLarge Hadron Collider (LHC)Compact Muon SolenoidTellurium compoundsArticle2-s2.0-8502935803910.1103/PhysRevLett.119.082301