Measurement of Z boson production in Pb-Pb collisions at √s NN=2.76 TeV with the ATLAS detector. Physical Review Letters Volume 110, Issue 2, 8 January 2013, Article number 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 √sNN=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. © 2013 CERN.



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Indexed keywords

ATLAS detectors; ATLAS experiment; Azimuthal distributions; Binary collisions; Decay channels; Glauber models; Integrated luminosity; Pb-Pb collisions; Systematic uncertainties; Two channel; Z Bosons