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

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

2011-02-26

arxiv.org/abs/1102.5435v1

Phys.Rev.Lett.106:212301,2011

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevLett.106.212301

A search for Z bosons in the mu^+mu^- decay channel has been performed in PbPb collisions at a nucleon-nucleon centre of mass energy = 2.76 TeV with the CMS detector at the LHC, in a 7.2 inverse microbarn data sample. The number of opposite-sign muon pairs observed in the 60--120 GeV/c^2 invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event 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 the number of incoherent nucleon-nucleon collisions.

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