Measurement of W ± Z production in proton-proton collisions at $\sqrt{s}=7~\mbox{TeV}$ 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 σtot
WZ = 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.