# Measurement of Z boson Production in Lead-Lead Collisions at $\sqrt{s_{NN}}$ 2.76 TeV with the ATLAS Detector

Citron, Zvi
Measurement of Z boson Production in Lead-Lead Collisions at $\sqrt{s_{NN}}$ 2.76 TeV with the ATLAS Detector.

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## Abstract

The ATLAS experiment has observed 1995 $Z$ boson candidates in 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 di-electron and di-muon decay channels. The results from both channels are consistent with each other and are combined. The background is less than 3% of the selected sample. Within the statistical and systematic uncertainties, the per-event $Z$ boson yield integrated over rapidity $|y^{Z}|<2.5$ is proportional to the number of binary collisions estimated by the Glauber model. The elliptic flow coefficient of the azimuthal distribution of the $Z$ boson with respect to the event plane is consistent with zero.

Item Type: Article 4 pages, 3 figures, Hard Probes 2012 nucl-ex, nucl-ex, hep-ex Symplectic Admin 22 Feb 2019 11:14 22 Aug 2019 18:10 10.1016/j.nuclphysa.2012.12.013 https://www.sciencedirect.com/science/article/pii/... http://livrepository.liverpool.ac.uk/id/eprint/3033264