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A search for Z bosons in the mu^+mu^- decay channel has been performed inPbPb collisions at a nucleon-nucleon centre of mass energy = 2.76 TeV with theCMS detector at the LHC, in a 7.2 inverse microbarn data sample. The number ofopposite-sign muon pairs observed in the 60--120 GeV/c^2 invariant mass rangeis 39, corresponding to a yield per unit of rapidity (y) and per minimum biasevent of (33.8 +/- 5.5 (stat) +/- 4.4 (syst)) 10^{-8}, in the |y|<2.0 range.Rapidity, transverse momentum, and centrality dependencies are also measured.The results agree with next-to-leading order QCD calculations, scaled by thenumber of incoherent nucleon-nucleon collisions.

Study of Z boson production in PbPb collisions at nucleon-nucleon centre of mass energy = 2.76 TeV