Measurement of the top quark pair production charge asymmetry in proton-proton collisions at √s = 7 TeV using the ATLAS detector
Author(s)Taylor, Frank E.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Journal of High Energy Physics
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
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