Measurement of Z Boson Production in Pb-Pb Collisions at ﬃﬃﬃﬃﬃﬃﬃﬃﬃ sNNp ¼2:76 TeVwith the ATLAS Detector
Çiftçi, Abbas Kenan
Yıldız (Duran), Hatice
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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.