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

Aad, G. and Abbott, B. and Abdallag, J. and Kjalek, S. A. and Abdinov, O. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Measurement of the top pair production cross section in 8 TeV proton-proton collisions using kinematic information in the lepton plus jets final state with ATLAS. PHYSICAL REVIEW D, 91 (11). ISSN 2470-0010

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Abstract

A measurement is presented of the t¯t inclusive production cross-section in pp collisions at a center-of-mass energy of √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¯t production cross-section was measured to be 260 ± 1(stat.)+22 −23(syst.) ± 8(lumi.) ± 4(beam) pb assuming a top-quark mass of 172.5 GeV, in good agreement with the theoretical prediction of 253+13 −15 pb. The t¯t → (e, μ)+jets production cross-section in the fiducial region determined by the detector acceptance is also reported.

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