Top cross section measurement at ATLAS

Measurements of the production cross section of top-quark pairs in pp collisions at sqrt(s) = 7 TeV are presented using 35/pb of data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in the single lepton (electron or muon) and dilepton topologies with multi-jets, and large missing transverse energy. The result is st ¯t = 180 +- 9(stat.) +-15(syst.) +- 6(lumi.) pb, which agrees with the Standard Model prediction.