Measurement of the cross section for top-quark pair production in pp collisions at √s = 7\,TeV with the ATLAS detector using final states with two high-p T leptons

A bstract A measurement is reported of the production cross section of top-quark pairs ( t t ) in proton-proton collisions at a center-of-mass energy of 7 TeV recorded with the ATLAS detector at the LHC. Candidate events have a signature consistent with containing two isolated leptons, large missing transverse momentum, and at least two jets. Using a data sample corresponding to an integrated luminosity of 0.70 fb −1 , a t t production cross section σt t = 176± 5( stat. )_ - 11+ 14( syst. )± 8( lum. ) pb is measured for an assumed top-quark mass of m t = 172 . 5 GeV. This measurement is in good agreement with Standard Model predictions.