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Due to the large $t\bar{t}$ production cross-section at the LHC energies, theATLAS experiment is expected to have enough statistics to measure $t\bar{t}$cross-section even at initial luminosities. Recent studies performed in ATLASon the development of $t\bar{t}$ cross-section measurements in the lepton+jetschannel at $\sqrt{s}$=10 TeV using the likelihood method will be discussed. Theexpected statistical and systematic uncertainties for the cross-sectionmeasurement using the likelihood method are evaluated for an integratedluminosity of 50 pb$^{-1}$ of Monte Carlo (MC) simulated data. Measurementswith data that will be collected in the first year of the LHC operation areemphasized.

Prospects for measuring $t\bar{t}$ production cross-section at $\sqrt{s}=10$ TeV using the likelihood method with the ATLAS detector