Measurement of $Z$ boson Production in Pb+Pb Collisions at $\\sqrts_NN=2.76$ TeV with the ATLAS Detector
Journal
Physical Review Letters
Journal Volume
110
Journal Issue
2
Pages
022301
Date Issued
2013
Author(s)
Aad, Georges et al. (The ATLAS Collaboration)
Abstract
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 sqrt[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.
Type
journal article