Prospects for measuring top pair production in the dilepton channel with early ATLAS data at $\sqrt{s}$=10 TeV

We present prospects for measuring the ttbar production cross-section with the ATLAS detector at a center-of-mass energy of 10 TeV with two leptons in the final state ($ee, \mu \mu$ and $e\mu$). The measurement aims to reestablish the top signal at the LHC with first data and gain confidence with signatures that involve leptons, jets and missing transverse energy. We introduce data-driven background estimation techniques for the dominant non-top Standard Model backgrounds and define control samples for the top dilepton sample. Assuming the Standard Model and an uncertainty of 20% in the early luminosity determination, we expect a measurement of the cross-section for an integrated luminosity of 200 pb$^{-1}$ in the combined channel with a relative uncertainty of $3.1 (\textrm{stat})_{-8.9}^{+9.6} (\textrm{syst})_{-17.4}^{+26.2}(\textrm{lumi})%$.