Measurement of the top pair production cross-section in 8 TeV proton-proton collisions using kinematic information in the lepton+jets final state with ATLAS

Abstract

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

Published version, 19 pages plus author list (35 pages total), 3 figures, 2 tables, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-06/

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