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Study of Jet quenching with Z+jet correlations in Pb-Pb and pp collisions at s NN=5.02 TeV

Sirunyan, A. M. and Tumasyan, A. R. and Adam, Wolfgang and Asilar, Ece and Bergauer, Thomas and Md. Ali, Mohd. Adli (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). 082301-1-082301-18. ISSN 0031-9007 E-ISSN 1079-7114

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The production of jets in association with Z bosons, reconstructed via the μþμ− and eþe− 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 pZ T > 60 GeV=c and a recoiling jet with pjet T > 30 GeV=c. The pT imbalance xjZ ¼ pjet T =pZ T, as well as the average number of jet partners per Z, RjZ, was studied in intervals of pZ T. 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 pjet T threshold because they lose energy.

Item Type: Article (Journal)
Additional Information: 7861/63136
Uncontrolled Keywords: Jet quenching; Z+jet correlations; Pb-Pb and pp collisions ; s NN=5.02 TeV
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Science
Kulliyyah of Science > Department of Physics
Depositing User: Dr Mohd Adli MD Ali
Date Deposited: 30 Aug 2019 16:57
Last Modified: 30 Aug 2019 16:57
URI: http://irep.iium.edu.my/id/eprint/63136

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