Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-10-18
Physics
High Energy Physics
High Energy Physics - Experiment
To be published in the proceedings of DPF-2009, Detroit, MI, July 2009, eConf C090726
Scientific paper
Due to the large $t\bar{t}$ production cross-section at the LHC energies, the ATLAS experiment is expected to have enough statistics to measure $t\bar{t}$ cross-section even at initial luminosities. Recent studies performed in ATLAS on the development of $t\bar{t}$ cross-section measurements in the lepton+jets channel at $\sqrt{s}$=10 TeV using the likelihood method will be discussed. The expected statistical and systematic uncertainties for the cross-section measurement using the likelihood method are evaluated for an integrated luminosity of 50 pb$^{-1}$ of Monte Carlo (MC) simulated data. Measurements with data that will be collected in the first year of the LHC operation are emphasized.
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