Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron

Understand

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 $A_{\mathrm{FB}}^{t\bar{t}} = 0.128 \pm 0.025$.