Logo image
Study of Jet Quenching with  Z + jet  Correlations in Pb-Pb and  p p  Collisions at  √ s N N = 5.02 TeV
Journal article   Open access   Peer reviewed

Study of Jet Quenching with Z + jet Correlations in Pb-Pb and p p Collisions at √ s N N = 5.02 TeV

CMS Collaboration, T Yetkin, B Bilki, W Clarida, K Dilsiz, S. Durgut, R. P. Gandrajula, M. Haytmyradov, V. Khristenko, J.-P Merlo, …
Physical review letters, Vol.119(8), 082301
2017
DOI: 10.1103/PhysRevLett.119.082301
PMID: 28952777
url
https://doi.org/10.1103/PhysRevLett.119.082301View
Published (Version of record) Open Access

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 pZT>60  GeV/c and a recoiling jet with pjetT>30  GeV/c. The pT imbalance xjZ=pjetT/pZT, as well as the average number of jet partners per Z, RjZ, was studied in intervals of pZT. 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 pjetT threshold because they lose energy.

Details

Logo image