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Study of jet quenching with Z+jet correlations in PbPb and pp collisions at $\sqrt{s_{NN}}$ = 5.02 TeV

The collaboration
No Journal Information, 2017

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.

• #### Table 1

Data from top panel of Fig. 2

10.17182/hepdata.77604.v1/t1

Distribution of the azimuthal angle difference between the Z boson and the jet in pp collisions. The distribution is normalized...

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Data from top panel of Fig. 2

10.17182/hepdata.77604.v1/t2

Distribution of the azimuthal angle difference between the Z boson and the jet in PbPb collisions. The distribution is normalized...

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Data from bottom panel of Fig. 2

10.17182/hepdata.77604.v1/t3

Distribution of the transverse momentum ratio between the Z boson and the jet in pp collisions. The distribution is normalized...

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Data from bottom panel of Fig. 2

10.17182/hepdata.77604.v1/t4

Distribution of the transverse momentum ratio between the Z boson and the jet in PbPb collisions. The distribution is normalized...

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Data from top panel of Fig. 3

10.17182/hepdata.77604.v1/t5

The mean value of the X_JZ distribution in pp collisions. The resolutions of the measured jet energy and azimuthal angle...

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Data from top panel of Fig. 3

10.17182/hepdata.77604.v1/t6

The mean value of the X_JZ distribution in PbPb collisions.

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Data from bottom panel of Fig. 3

10.17182/hepdata.77604.v1/t7

The average number of jet partners per Z boson in pp collisions. The resolutions of the measured jet energy and...

• #### Table 8

Data from bottom panel of Fig. 3

10.17182/hepdata.77604.v1/t8

The average number of jet partners per Z boson in PbPb collisions.

• #### Table 9

Data from top panel of Fig. 4

10.17182/hepdata.77604.v1/t9

Distribution of the transverse momentum ratio between the Z boson and the jet in pp collisions. The distribution is normalized...