Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
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Aad-2014-Measurement of the top quark pair.pdf
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Author(s)
Taylor, Frank E.
Date Issued
February 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, O. Abdinov, R. Aben, et al. “Measurement of the Top Quark Pair Production Charge Asymmetry in Proton-Proton Collisions at √s = 7 TeV Using the ATLAS Detector.” J. High Energ. Phys. 2014, no. 2 (February 2014). © CERN,
for the benefit of the ATLAS Collaboration
Version
Final published version
Abstract
This paper presents a measurement of the top quark pair (t[bar over t]) production charge asymmetry A [subscript C] using 4.7 fb[superscript −1] of proton-proton collisions at a centre-of-mass energy √s = 7 TeV collected by the ATLAS detector at the LHC. A t[bar over t]-enriched sample of events with a single lepton (electron or muon), missing transverse momentum and at least four high transverse momentum jets, of which at least one is tagged as coming from a b-quark, is selected. A likelihood fit is used to reconstruct the t[bar over t] event kinematics. A Bayesian unfolding procedure is employed to estimate A [subscript C] at the parton-level. The measured value of the t[bar over t] production charge asymmetry is A [subscript C] = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential A [subscript C] measurements as a function of the invariant mass, the rapidity and the transverse momentum of the t[bar over t] system are also presented. In addition, A [subscript C] is measured for a subset of events with large t[bar over t] velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1007/jhep02(2014)107
