Study of jet quenching with Z+jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 5.02 TeV

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 PbPb collisions. Both data samples were collected by the CMS experiment at the LHC, at a center-of-mass energy of 5.02 TeV. The PbPb collisions were analyzed in the 0-30% centrality range. The back-to-back azimuthal alignment was studied in both pp and PbPb collisions for Z bosons with transverse momentum ptz > 60 GeV/c and a recoiling jet with ptj > 30 GeV/c. The pt imbalance, xjz= ptj/ptz, as well as the average number of jet partners per Z, rjz, were studied in intervals of ptz, in both pp and PbPb collisions. The rjz is found to be smaller in PbPb than in pp collisions, which suggests that in PbPb collisions a larger fraction of partons, associated with the Z bosons, lose energy and fall below the 30 GeV/c ptj threshold.
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Physical Review Letters, American Physical Society, 2017, 119, pp.082301. 〈10.1103/PhysRevLett.119.082301〉
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http://hal.in2p3.fr/in2p3-01456783
Contributeur : Sylvie Flores <>
Soumis le : lundi 6 février 2017 - 07:21:47
Dernière modification le : jeudi 10 mai 2018 - 02:00:17

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A.M. Sirunyan, M. Besançon, F. Couderc, M. Dejardin, D. Denegri, et al.. Study of jet quenching with Z+jet correlations in PbPb and pp collisions at sqrt(s[NN]) = 5.02 TeV. Physical Review Letters, American Physical Society, 2017, 119, pp.082301. 〈10.1103/PhysRevLett.119.082301〉. 〈in2p3-01456783〉

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