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A measurement of the production cross-section for top quark pairs($\ttbar$)in $pp$ collisions at $\sqrt{s}=7 \TeV$ is presented using data recorded withthe ATLAS detector at the Large Hadron Collider. Events are selected in twodifferent topologies: single lepton (electron $e$ or muon $\mu$) with largemissing transverse energy and at least four jets, and dilepton ($ee$, $\mu\mu$or $e\mu$) with large missing transverse energy and at least two jets. In adata sample of 2.9 pb-1, 37 candidate events are observed in the single-leptontopology and 9 events in the dilepton topology. The corresponding expectedbackgrounds from non-$\ttbar$ Standard Model processes are estimated usingdata-driven methods and determined to be $12.2 \pm 3.9$ events and $2.5 \pm0.6$ events, respectively. The kinematic properties of the selected events areconsistent with SM $\ttbar$ production. The inclusive top quark pair productioncross-section is measured to be $\sigmattbar=145 \pm 31 ^{+42}_{-27}$ pb wherethe first uncertainty is statistical and the second systematic. The measurementagrees with perturbative QCD calculations.

Measurement of the top quark-pair production cross section with ATLAS in pp collisions at $\sqrt{s}=7\TeV$