Study of Jet Quenching with $Z+\text{jet}$ Correlations in Pb-Pb and $pp$ Collisions at ${\sqrt{s}}_{NN}=5.02\text{ }\text{ }\mathrm{TeV}$ - INSPIRE

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Study of Jet Quenching with $Z+\text{jet}$ Correlations in Pb-Pb and $pp$ Collisions at ${\sqrt{s}}_{NN}=5.02\text{ }\text{ }\mathrm{TeV}$

CMS

Collaboration

Feb 3, 2017

18 pages

Published in:

Phys.Rev.Lett. 119 (2017) 8, 082301

Published: Aug 23, 2017

e-Print:

1702.01060 [nucl-ex]

DOI:

10.1103/PhysRevLett.119.082301

Report number:

CMS-HIN-15-013,
CERN-EP-2017-002

Experiments:

CERN-LHC-CMS

View in:

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Abstract: (APS)

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 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.

Note:

Replaced with the published version. Added the journal reference and DOI. All the figures and tables, including additional supplemental figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-15-013

p p: scattering
jet: energy resolution
jet: correlation
jet: production
jet: quenching
angular distribution
electron: decay
transverse momentum
heavy ion: scattering
CERN LHC Coll

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