Measurements of the Z boson in lepton pair decays in heavy ion collisions at ATLAS
Joint Institute for Nuclear Research, Dubna, Russia
a e-mail: Valeri.Pozdnyakov@cern.ch
Published online: 10 April 2014
Measurement of Z boson production in Pb+Pb collisions at √sNN = 2.76 TeV with the ATLAS detector, obtained for approximately 0.15 nb−1 data collected in 2011 LHC run is presented. The Z bosons are reconstructed in their di-electron and di-muon decay channels. The results from both channels are found to be consistent and hence combined. Within the statistical and systematic uncertainties, the per-event Z boson yield integrated over rapidity |yZ| < 2.5, is found to be proportional to the number of binary collisions calculated by the Glauber model. The elliptic flow coefficient of the Z boson azimuthal distribution with respect to the event plane is found to be consistent with zero.
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