Measurement of the W Boson Production Cross-Section in pp Collisions at 7 TeV with the ATLAS Experiment

We present a measurement of the W boson cross-section in the electron and muon decay channels, using $7\,\mathrm{TeV}$ proton-proton collisions at the LHC. The dataset used in the analysis corresponds to an integrated luminosity of $35\,\mathrm{pb}^{-1}$, collected by the ATLAS detector during 2010. The major backgrounds come from $\mathrm{W}\to\tau\nu$, $\mathrm{Z}\to\mu\mu$ where a lepton is lost, and from QCD, particularly from heavy flavor decays. Lepton kinematic, isolation, missing energy and transverse mass criteria are adopted to extract the signal, and the cross-sections and kinematic distributions are compared with next-to-leading order Standard Model expectations.