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

Allison, Lee and Barton, Adam and Beattie, Michael and Borissov, Guennadi and Bouhova-Thacker, Eva and Chilingarov, Alexandre and Dearnaley, William and Fox, Harald and Grimm, Kathryn and Henderson, Robert and Hughes, Gareth and Jones, Roger William Lewis and Kartvelishvili, Vakhtang and Long, Robin and Love, Peter and Maddocks, Harvey and Smizanska, Maria and Walder, James (2015) 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. Journal of High Energy Physics, 2015 (6). ISSN 1029-8479

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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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Additional Information:
Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. Evidence of Acceptance on Publisher PDF
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
75474
Deposited By:
Deposited On:
09 Sep 2015 06:34
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Jul 2020 05:22