Abstract
The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of sqrt[s]=1.96 TeV. We report the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. The combined inclusive asymmetry is A_{FB}^{tt[over ¯]}=0.128±0.025. The combined inclusive and differential asymmetries are consistent with recent standard model predictions.
Highlights
The We full data sets collected in protonreport the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities
The production of top and antitop quark pairs at the Tevatron proton-antiproton collider at Fermilab is dominated by the qqannihilation process, which can lead to asymmetries, AtFtB, in the number of top quarks produced within the hemisphere centered on the beam proton relative to those that are produced within the antiproton hemisphere
In the standard model (SM), no forward-backward asymmetries are expected at leading order in perturbative quantum chromodynamics (QCD)
Summary
The We full data sets collected in protonreport the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. Inclusive and differential measurements [8,9] by the CDF [10] and D0 Both collaborations have measured inclusive and differential asymmetries as functions of kinematic quantities of the top quarks and their decay leptons. The combined inclusive-lepton asymmetries AlFB and AlFBl are compared to the NLO QCD þ NLO EW predictions of Ref.
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