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Study of Z production in PbPb and pp collisions at $s_NN$ = 2.76 TeV in the dimuon and dielectron decay channels

Journal Contribution - Journal Article

The production of Z bosons is studied in the dimuon and dielectron decay channels in PbPb and pp collisions at sNN‾‾‾‾√=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−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−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.
Journal: Journal of High Energy Physics
ISSN: 1126-6708
Issue: 3
Volume: 2015
Pages: 1-35
Publication year:2015
Keywords:particle and resonance production, heavy ions, heavy-ions collision, proton-proton scattering, CMS, Physics
CSS-citation score:2
Accessibility:Open