Measurement of the W+W − diboson production cross-section with the ATLAS Experiment


This thesis presents the first measurement of the W+W − production cross section in proton-proton collisions at s = 7 TeV using the complete data set of 4.7 fb−1 collected by the ATLAS detector at the LHC in the year 2011. Three di-leptonic decay channels of the W+W − pairs are used for this ana-lysis: decays into two electrons, two muons, and decays into one electron and one muon. For each channel, a region with a high fraction of W+W− events is selected and contributions from background processes are estim-ated using Monte Carlo simulations and data-driven techniques. In total, 1524 W+W − candidate events are selected, with an estimated background of 545 ± 52 events. The result of the measurement is: σ(pp → W+W−) = 52.6 ± 2.1(stat) ± 4.5(syst) ± 2.1(lumi) pb This is compatible with the Standard Model cross-section prediction at next-to-leading order of σ(pp → W+W−) = 47.0+2.0−1.5 pb

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