Measurements of Wγ and Zγ production in pp collisions at √s=7 TeV with the ATLAS detector at the LHC

The integrated and differential fiducial cross sections for the production of a W or Z boson in
association with a high-energy photon are measured using pp collisions at √s=7 TeV. The analyses
use a data sample with an integrated luminosity of 4:6 fb1 collected by the ATLAS detector during the
2011 LHC data-taking period. Events are selected using leptonic decays of the W and Z bosons
[Wðe; Þ and Zðeþe;þ; Þ] with the requirement of an associated isolated photon. The data
are used to test the electroweak sector of the Standard Model and search for evidence for new phenomena.
The measurements are used to probe the anomalous WWgamma, ZZgamma, and Zgammagamma triple-gauge-boson couplings
and to search for the production of vector resonances decaying to Z and W. No deviations from
Standard Model predictions are observed and limits are placed on anomalous triple-gauge-boson
couplings and on the production of new vector meson resonances.