Abstract
The production of jets in association with bosons, reconstructed via the and decay channels, is studied in 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 and Pb-Pb collisions for bosons with transverse momentum and a recoiling jet with . The imbalance , as well as the average number of jet partners per , , was studied in intervals of . The is found to be smaller in Pb-Pb than in collisions, which suggests that in Pb-Pb collisions a larger fraction of partons associated with the bosons fall below the threshold because they lose energy.
- Received 3 February 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.082301
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.
© 2017 CERN, for the CMS Collaboration
Physics Subject Headings (PhySH)
Synopsis
A Precise Probe of the Quark-Gluon Plasma
Published 23 August 2017
Properties of the quark-gluon plasma can be inferred from measurements of jets and Z bosons simultaneously produced in the ion collisions that create the plasma.
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