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.

Study of jet quenching with Z+jet correlations in PbPb and pp collisions at sqrt(s_NN) = 5.02 TeV

CANDELISE, V.;DELLA RICCA, G.;
2017

Abstract

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.
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PHYSICAL REVIEW LETTERS
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.082301
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2909223
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