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A measurement of the top quark pair-production cross section in thelepton+jets decay channel is presented. It is based on 4.6 fb$^{-1}$ of$\sqrt{s} = 7$ TeV $pp $ collision data collected during 2011 by the ATLASexperiment at the CERN Large Hadron Collider. A three-class, multidimensionalevent classifier based on support vector machines is used to differentiate$t\bar{t}$ events from backgrounds. The $t\bar{t}$ production cross section isfound to be $\sigma_{t\bar{t}}=168.5 \pm0.7$(stat.)$^{+6.2}_{-5.9}$(syst.)$^{+3.4}_{-3.2}$(lumi.) pb. The result isconsistent with the Standard Model prediction based on QCD calculations atnext-to-next-to-leading order.

cornell university

Measurement of the inclusive $t\bar{t}$ production cross section in the  lepton+jets channel in $pp$ collisions at $\sqrt{s}$= 7 TeV with the ATLAS  detector using support vector machines