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

Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at s NN=5.02 TeV. PHYSICAL REVIEW LETTERS, 119(8) [10.1103/PhysRevLett.119.082301].

Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at s NN=5.02 TeV

Brianza, L.;Brivio, F.;Ciriolo, V.;Dinardo, M. E.;Fiorendi, S.;Ghezzi, A.;Govoni, P.;Malberti, M.;Manzoni, R. A.;Paganoni, M.;Pigazzini, S.;Ragazzi, S.;Tabarelli De Fatis, T.;Lucchini, M. T.;De Guio, F.;
2017

Abstract

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
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English
Sirunyan, A., Tumasyan, A., Adam, W., Asilar, E., Bergauer, T., Brandstetter, J., et al. (2017). Study of Jet Quenching with Z+jet Correlations in Pb-Pb and pp Collisions at s NN=5.02 TeV. PHYSICAL REVIEW LETTERS, 119(8) [10.1103/PhysRevLett.119.082301].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187994
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