Measurement of Z boson production in Pb-Pb collisions at root s(NN)=2.76 TeV with the ATLAS Detector
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CitationAad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A.A. ... ATLAS Collaboration. (2013). Measurement of Z boson production in Pb-Pb collisions at root s(NN)=2.76 TeV with the ATLAS Detector. Physical Review Letters, 110 (2), 18p. http://dx.doi.org/10.1103/PhysRevLett.110.022301.
The ATLAS experiment has observed 1995 Z boson candidates in data corresponding to 0.15 nb(-1) of integrated luminosity obtained in the 2011 LHC Pb + Pb run at root s(NN) = 2.76 TeV. The Z bosons are reconstructed via dielectron and dimuon decay channels, with a background contamination of less than 3%. Results from the two channels are consistent and are combined. Within the statistical and systematic uncertainties, the per-event Z boson yield is proportional to the number of binary collisions estimated by the Glauber model. The elliptic anisotropy of the azimuthal distribution of the Z boson with respect to the event plane is found to be consistent with zero.