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

TL;DR

This paper reports combined measurements of forward-backward asymmetries in top-antitop quark production at the Tevatron, showing results consistent with the Standard Model predictions.

Contribution

It provides the first combined analysis of asymmetries from CDF and D0, including inclusive and differential measurements at 1.96 TeV.

Findings

Combined asymmetry $A_{FB}^{t\bar{t}} = 0.128 \pm 0.025

Results are consistent with Standard Model predictions

Includes differential asymmetry measurements

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 $A_{\mathrm{FB}}^{t\bar{t}} = 0.128 \pm 0.025$. The combined inclusive and differential asymmetries are consistent with recent standard model predictions.