We present the measurement of the production cross section for top quark pair
(ttˉ) in pp collisions at s​ = 7 TeV using the data recorded
with the ATLAS detector at the Large Hadron Collider (LHC). Events are selected
in single lepton (electron or muon) and dilepton (ee, μμ, eμ)
topologies with multi-jets, and large missing transverse energy (MET). The
combined result from these measurements is σttˉ​ = 176±5(stat.)−10+13​(syst.)±7(lumi.)pb, which is in good agreement with the Standard Model prediction.Comment: 8 pages, 9 figures, Proceedings of the DPF-2011 Conference,
Providence, RI, August 8-13, 201