Study of Jet Quenching with Z plus jet Correlations in Pb-Pb and pp Collisions at root s(NN)=5.02 TeV
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Author(s)
Type
Journal Article
Abstract
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.
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.
Date Issued
2017-08-23
Date Acceptance
2017-07-03
Citation
Physical Review Letters, 2017, 119 (8)
ISSN
0031-9007
Publisher
American Physical Society
Journal / Book Title
Physical Review Letters
Volume
119
Issue
8
Copyright Statement
Published by the American Physical Society under the terms of
the Creative Commons Attribution 4.0 International license.
Further distribution of this work must maintain attribution to
the author(s) and the published article’s title, journal citation,
and DOI.
the Creative Commons Attribution 4.0 International license.
Further distribution of this work must maintain attribution to
the author(s) and the published article’s title, journal citation,
and DOI.
License URL
Subjects
Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
HEAVY-ION COLLISIONS
QUARK-GLUON PLASMA
RADIATIVE ENERGY-LOSS
MATTER
Publication Status
Published
Article Number
082301