W and Z Production in pp Collisions at 7 TeV with the ATLAS Experiment at the LHC
Abstract
The observation of W and Z bosons and a measurement of the production cross sections in proton proton collisions at ECM = 7 TeV are presented using data from the ATLAS experiment at the LHC. Results are based on 118 W -> lnu and 125 Z/gamma* -> ll (l=e,mu) candidate events corresponding to an integrated luminosity of about 17 nb-1 and 225 nb-1 respectively. The measured values of sigmaW x BR(W -> lnu) = 9.3 0.9 (stat) 0.6 (syst) 1.0 (lumi) nb and sigmaZ/gamma* x BR(Z/gamma* -> ll, 66<mll<116) = 0.83 0.07 (stat) 0.06 (syst) 0.09 (lumi) nb. A measurement of the W lepton charge asymmetry is also reported. A comparison with theoretical predictions based on NNLO QCD calculations shows agreement with the measurements.
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