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Type: Journal article
Title: Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
Other Titles: Measurement of the top quark pair production charge asymmetry in proton-proton collisions at root s = 7 TeV using the ATLAS detector
Author: Aad, G.
ATLAS Collaboration
Citation: The Journal of High Energy Physics, 2014; 2014(2):1-37
Publisher: Springer
Issue Date: 2014
ISSN: 1029-8479
Statement of
G. Aad … P. Jackson … L. Lee … A. Petridis … N. Soni ... M. White ... et al. (The ATLAS Collaboration)
Abstract: This paper presents a measurement of the top quark pair (tt¯) production charge asymmetry AC using 4.7 fb−1 of proton-proton collisions at a centre-of-mass energy s√ = 7 TeV collected by the ATLAS detector at the LHC. A tt¯-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 tt¯ event kinematics. A Bayesian unfolding procedure is employed to estimate AC at the parton-level. The measured value of the tt¯ production charge asymmetry is AC = 0.006 ± 0.010, where the uncertainty includes both the statistical and the systematic components. Differential AC measurements as a function of the invariant mass, the rapidity and the transverse momentum of the tt¯ system are also presented. In addition, AC is measured for a subset of events with large tt¯ velocity, where physics beyond the Standard Model could contribute. All measurements are consistent with the Standard Model predictions.
Keywords: Hadron-Hadron scattering, top physics
Rights: © The Author(s) 2014. Open Access, Copyright CERN, for the benefit of the ATLAS Collaboration. Article funded by SCOAP3. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
DOI: 10.1007/JHEP02(2014)107
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