Measurement of $W^{\pm}Z$ boson pair-production in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS Detector and confidence intervals for anomalous triple gauge boson couplings

A measurement of the $W^{\pm}Z$ production cross section, in proton-proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider, is presented. The data used were recorded with the ATLAS detector in 2015 and 2016, and corresponds to an integrated luminosity of $13.3$ fb$^{-1}$. Only leptonic decay channels, where the gauge bosons decay to either electrons or muons, are considered. The differential cross section is measured as a function of the transverse momentum of the reconstructed $Z$ boson and of the transverse mass of the $W^{\pm}Z$ system. Confidence intervals for anomalous triple gauge boson couplings are derived from the transverse mass spectrum of the $W^{\pm}Z$ system.