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  • 1502.05923v2

    Rights statement: c 2015 CERN for the benefit of the ATLAS Collaboration. Reproduction of this article or parts of it is allowed as specified in the CC-BY-3.0 license.

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  • art%3A10.1007%2FJHEP06%282015%29100

    Rights statement: Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3.

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Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at s √ =7 TeV in the ATLAS detector

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Article number100
<mark>Journal publication date</mark>16/06/2015
<mark>Journal</mark>Journal of High Energy Physics
Issue number6
Volume2015
Number of pages56
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Various differential cross-sections are measured in top-quark pair (tt ¯ ) events produced in proton-proton collisions at a centre-of-mass energy of s √ =7 TeV at the LHC with the ATLAS detector. These differential cross-sections are presented in a data set corresponding to an integrated luminosity of 4.6 fb−1. The differential cross-sections are presented in terms of kinematic variables, such as momentum, rapidity and invariant mass, of a top-quark proxy referred to as the pseudo-top-quark as well as the pseudo-top-quark pair system. The dependence of the measurement on theoretical models is minimal.

The measurements are performed on tt ¯ events in the lepton+jets channel, requiring exactly one charged lepton and at least four jets with at least two of them tagged as originating from a b-quark. The hadronic and leptonic pseudo-top-quarks are defined via the leptonic or hadronic decay mode of the W boson produced by the top-quark decay in events with a single charged lepton. Differential cross-section measurements of the pseudo-top-quark variables are compared with several Monte Carlo models that implement next-to-leading order or leading-order multi-leg matrix-element calculations.

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Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. Evidence of Acceptance on Publisher PDF