Study of Z production in PbPb and pp collisions at √s[subscript NN] = 2.76 TeV in the dimuon and dielectron decay channels
Author(s)
Apyan, Aram; Barbieri, Richard Alexander; Busza, Wit; Cali, Ivan Amos; Di Matteo, Leonardo; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Wyslouch, Victoria; Bauer, Gerry P; Chan, M.; Luckey Jr, P David; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; ... Show more Show less
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The production of Z bosons is studied in the dimuon and dielectron decay channels in PbPb and pp collisions at √s[subscript NN] = 2.76 TeV, using data collected by the CMS experiment at the LHC. The PbPb data sample corresponds to an integrated luminosity of about 166 μb[superscript −1], while the pp data sample collected in 2013 at the same nucleon-nucleon centre-of-mass energy has an integrated luminosity of 5.4 pb[superscript −1]. The Z boson yield is measured as a function of rapidity, transverse momentum, and collision centrality. The ratio of PbPb to pp yields, scaled by the number of inelastic nucleon-nucleon collisions, is found to be 1.06 ± 0.05 (stat) ± 0.08 (syst) in the dimuon channel and 1.02 ± 0.08 (stat) ± 0.15 (syst) in the dielectron channel, for centrality-integrated Z boson production. This binary collision scaling is seen to hold in the entire kinematic region studied, as expected for a colourless probe that is unaffected by the hot and dense QCD medium produced in heavy ion collisions.
Date issued
2015-03Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, W. Adam, T. Bergauer, M. Dragicevic, J. Ero, et al. “Study of Z Production in PbPb and Pp Collisions at √s[subscript NN] = 2.76 TeV in the Dimuon and Dielectron Decay Channels.” J. High Energ. Phys. 2015, no. 3 (March 2015). © 2015 CERN, for the benefit of the CMS Collaboration
Version: Final published version
ISSN
1029-8479
1126-6708