$t\bar{t}$ Cross Section Measurement in Muon + Jets Channel at ATLAS Using Kinematic Information

We present a Monte Carlo study of prospects for measuring the $t\bar{t}$ production cross-section with the ATLAS detector at a center-of-mass energy of 10 TeV using events with one muon, missing transverse energy, and at least four jets in the final state. We employ a multivariate technique which uses the kinematic and topological information of the event to separate $t\bar{t}$ signal from background processes. The suggested method is aimed at early measurement of the $t\bar{t}$ cross section using 50 pb$^{-1}$ of data. Assuming this amount of data, the $t\bar{t}$ cross section can be measured with accuracy of $\Delta\sigma / \sigma = \pm 25\%$ (syst) $\pm 6\% $ (fit+stat).