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We present simulations of the production cross-section measurement oftop-antitop pairs in the di-leptonic decay channel with the ATLAS detector.This study uses the Commissioning Service Challenge (CSC) data, which is thelatest and centrally produced Monte-Carlo data set to validate the detectorsimulation before the actual data taking. The signal process was generated withMC@NLO and important background processes were studied. A cut and count methodand two likelihood methods were employed to measure the cross section andimportant systematic effects were investigated. The expected statistical andsystematic errors for a luminosity of 100 $\ipb$ are also given.

Top-Antitop cross section measurement in the di-lepton decay channel with ATLAS