Measurement of the top pair production cross section in 8 TeV proton-proton collisions using kinematic information in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext mathvariant="bold">lepton</mml:mtext><mml:mo>+</mml:mo><mml:mtext mathvariant="bold">jets</mml:mtext></mml:mrow></mml:math>final state with ATLAS

A measurement is presented of the $t\overline{t}$ inclusive production cross section in $pp$ collisions at a center-of-mass energy of $\sqrt{s}=8\text{ }\text{ }\mathrm{TeV}$ using data collected by the ATLAS detector at the CERN Large Hadron Collider. The measurement was performed in the $\text{lepton}+\text{jets}$ final state using a data set corresponding to an integrated luminosity of $20.3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The cross section was obtained using a likelihood discriminant fit and $b$-jet identification was used to improve the signal-to-background ratio. The inclusive $t\overline{t}$ production cross section was measured to be $260\ifmmode\pm\else\textpm\fi{}1{(\text{stat})}_{\ensuremath{-}23}^{+22}(\text{stat})\ifmmode\pm\else\textpm\fi{}8(\text{lumi})\ifmmode\pm\else\textpm\fi{}4(\text{beam})\text{ }\text{ }\mathrm{pb}$ assuming a top-quark mass of 172.5 GeV, in good agreement with the theoretical prediction of ${253}_{\ensuremath{-}15}^{+13}\text{ }\text{ }\mathrm{pb}$. The $t\overline{t}\ensuremath{\rightarrow}(e,\ensuremath{\mu})+\text{jets}$ production cross section in the fiducial region determined by the detector acceptance is also reported.

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