Measurement of W± Z production in proton-proton collisions at √(s)=7 TeV with the ATLAS detector

A study of W ± Z production in proton-proton collisions at √(s) = 7 TeV is presented using data corresponding to an integrated luminosity of 4.6 fb-1 collected with the ATLAS detector at the Large Hadron Collider in 2011. In total, 317 candidates, with a background expectation of 68±10 events, are observed in double-leptonic decay final states with electrons, muons and missing transverse momentum. The total cross-section is determined to be σWZtot= 19.0+1.4-1.3 (stat.)±0.9 (syst.)± 0.4 (lumi.) pb, consistent with the Standard Model expectation of 17.6+1.1-1.0 pb. Limits on anomalous triple gauge boson couplings are derived using the transverse momentum spectrum of Z bosons in the selected events. The cross-section is also presented as a function of Z boson transverse momentum and diboson invariant mass. (orig.)