Measurement of the forward–backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set

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Measurement of the forward–backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set

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Title: Measurement of the forward–backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set
Author: Franklin, Melissa; Huth, John; Morii, Masahiro

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Citation: ATLAS Collaboration. 2016. Measurement of the Forward–backward Asymmetry of Top-Quark and Antiquark Pairs Using the Full CDF Run II Data Set. Phys. Rev. D 93, no. 11. doi:10.1103/physrevd.93.112005.
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Abstract: We measure the forward–backward asymmetry of the production of top quark and antiquark pairs in proton-antiproton collisions at center-of-mass energy √ s = 1.96 TeV using the full data set collected by the Collider Detector at Fermilab (CDF) in Tevatron Run II corresponding to an integrated luminosity of 9.1 fb−1. The asymmetry is characterized by the rapidity difference between top quarks and antiquarks (∆y), and measured in the final state with two charged leptons (electrons and muons). The inclusive asymmetry, corrected to the entire phase space at parton level, is measured to be A tt¯ FB = 0.12 ± 0.13, consistent with the expectations from the standard-model (SM) and previous CDF results in the final state with a single charged lepton. The combination of the CDF measurements of the inclusive A tt¯ FB in both final states yields A tt¯ FB = 0.160 ± 0.045, which is consistent with the SM predictions. We also measure the differential asymmetry as a function of ∆y. A linear fit to A tt¯FB(|∆y|), assuming zero asymmetry at ∆y = 0, yields a slope of α = 0.14 ± 0.15, consistent with the SM prediction and the previous CDF determination in the final state with a single charged lepton. The combined slope of A tt¯ FB(|∆y|) in the two final states is α = 0.227 ± 0.057, which is 2.0σ larger than the SM prediction.
Published Version: doi:10.1103/PhysRevD.93.112005
Other Sources: https://arxiv.org/pdf/1602.09015.pdf
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:29058551
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