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.

(2017). Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at √sNN=5.02  TeV [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from http://hdl.handle.net/10446/140530

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

Re, V.;Vai, I.;
2017-01-01

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.
articolo
2017
Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; F...espandi
(2017). Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at √sNN=5.02  TeV [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from http://hdl.handle.net/10446/140530
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/140530
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