Study of jet quenching with Z + jet correlations in Pb-Pb and pp collisions at √sNN=5.02TeV
Type :
Article
Publication Status :
Published
Access :
restrictedAccess
Abstract
The production of jets in association with Z bosons, reconstructed via the mu(+)mu(-) 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 p(T)(Z) > 60 GeV/c and a recoiling jet with p(T)(jet) > 30 GeV/c. The p(T) imbalance x(jZ) = p(T)(jet)/p(T)(Z), as well as the average number of jet partners per Z, R-jZ, was studied in intervals of p(T)(Z). The R-jZ 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 p(T)(jet) threshold because they lose energy.
Source :
Physical Review Letters
Date :
2017-08-23
Volume :
119
Issue :
8
Publisher :
American Physical Society
URI
http://hdl.handle.net/10679/5631https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.119.082301
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