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This paper presents measurements of $W^\pm Z$ production in $pp$ collisionsat a center-of-mass energy of 8 TeV. The gauge bosons are reconstructed usingtheir leptonic decay modes into electrons and muons. The data were collected in2012 by the ATLAS experiment at the Large Hadron Collider, and correspond to anintegrated luminosity of 20.3 fb$^{-1}$. The measured inclusive cross sectionin the detector fiducial region is $\sigma_{W^\pm Z \rightarrow \ell^{'} \nu\\ell \ell} = 35.1 \pm$ 0.9 (stat.) $\pm 0.8$ (sys.) $\pm 0.8$ (lumi.) fb, forone leptonic decay channel. In comparison, the next-to-leading-order StandardModel expectation is 30.0 $\pm$ 2.1 fb. Cross sections for $W^+Z$ and $W^-Z$production and their ratio are presented as well as differential cross sectionsfor several kinematic observables. Limits on anomalous triple gauge bosoncouplings are derived from the transverse mass spectrum of the $W^\pm Z$system. From the analysis of events with a $W$ and a $Z$ boson associated withtwo or more forward jets an upper limit at 95% confidence level on the $W^\pmZ$ scattering cross section of 0.63 fb, for each leptonic decay channel, isestablished, while the Standard Model prediction at next-to-leading order is0.13 fb. Limits on anomalous quartic gauge boson couplings are also extracted.

physical review. d/physical review. d.

Measurements of $W^\pm Z$ production cross sections in $pp$ collisions  at $\sqrt{s} = 8$ TeV with the ATLAS detector and limits on anomalous gauge  boson self-couplings