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A measurement of the cross section of top quark pair production in proton−proton collisions at a center-of-mass of 7 TeV at the LHC using events with an isolated mu and a au lepton decaying hadronically is reported. In addition to a mu and a au lepton, large missing transverse energy and two or more jets are required. At least one of the jets must be identified as originating from a b quark. To identify au leptons, the analysis uses a multivariate technique based on boosted decision trees. A data sample collected by ATLAS corresponding to an integrated luminosity of 1.08 mfb−1 yields [ sigma_{tar{t}} = 142pm 21 stat pm^{20}_{16}syst pm 5 ( ext{lumi.}) ext{pb.}
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