Abstract
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 sqrt{s} = 7 TeV. The analyses use a data sample with an integrated luminosity of 4.6 fb^{-1} collected by the ATLAS detector during the 2011 LHC data-taking period. Events are selected using leptonic decays of the W and Z bosons (W(e nu,mu nu) and Z(e+ e-, mu+ mu-, nu nubar)) 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 Zgamma and Wgamma. 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.
Highlights
The Standard Model (SM) has proved to provide an accurate description of the production of elementary particles observed in high-energy physics experiments
The data used for the analyses presented in this paper were collected in 2011 from pp collisions at a center-ofmass energy of 7 TeV
The inclusive and exclusive production cross sections in the extended fiducial regions defined in Table IV for the ‘, ‘þ‘À, and " final states are compared as described above to the NLO predictions made by the MCFM generator
Summary
The Standard Model (SM) has proved to provide an accurate description of the production of elementary particles observed in high-energy physics experiments. The high center-of-mass energy allows searches for new particles, for example, techni-mesons which are predicted in technicolor models [1,2], that decay to these final states. Previous measurements of W and Z final states from pp" and pp production have been made at the Tevatron, by the CDF [4] and DØ [5,6] collaborations, and at the LHC by the ATLAS [7,8] and CMS [9] collaborations These experiments have set limits on anomalous triple gaugeboson couplings (aTGCs) that are improved on by the current analysis. This paper is organized as follows: An overview of the ATLAS detector and the data samples used is given in
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