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Scientific article
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English

Measurement of the top quark-pair production cross section with ATLAS in pp collisions at √s=7 TeV

ContributorsATLAS Collaboration
Published inEuropean physical journal. C, Particles and fields, vol. 71, no. 1577, 36
Publication date2011
Abstract

A measurement of the production cross-section for top quark pairs (tt) in pp collisions at √s=7 TeV is presented using data recorded with the ATLAS detector at the Large Hadron Collider. Events are selected in two different topologies: single lepton (electron e or muon μ) with large missing transverse energy and at least four jets, and dilepton (ee, μμ or eμ) with large missing transverse energy and at least two jets. In a data sample of 2.9 pb−1, 37 candidate events are observed in the single-lepton topology and 9 events in the dilepton topology. The corresponding expected backgrounds from non- tt Standard Model processes are estimated using data-driven methods and determined to be 12.2±3.9 events and 2.5±0.6 events, respectively. The kinematic properties of the selected events are consistent with SM tt production. The inclusive top quark pair production cross-section is measured to be σt=145±31(stat.)+42−27(syst.) pb. The measurement agrees with perturbative QCD calculations.

Citation (ISO format)
ATLAS Collaboration. Measurement of the top quark-pair production cross section with ATLAS in pp collisions at √s=7 TeV. In: European physical journal. C, Particles and fields, 2011, vol. 71, n° 1577, p. 36. doi: 10.1140/epjc/s10052-011-1577-6
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Article (Published version)
accessLevelPublic
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ISSN of the journal1434-6044
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