Measurement of the asymmetry in angular distributions of leptons produced in dilepton ttbar final states in ppbar collisions at sqrt(s)=1.96 TeV

TL;DR

This paper measures angular asymmetries of leptons in top-antitop quark pair events at the Tevatron, finding results consistent with Standard Model predictions using a large dataset.

Contribution

First measurement of lepton angular asymmetries in dilepton ttbar events at the Tevatron with high precision.

Findings

Asymmetries are compatible with Standard Model predictions

Large dataset of 9.7 fb^-1 used for analysis

Results support current theoretical models of top quark decays

Abstract

We present measurements of asymmetries in angular distributions of leptons produced in ttbar events in proton-antiproton collisions at the Fermilab Tevatron Collider. We consider final states where the W bosons from top quark and antiquark decays both decay into l nu (l=e, mu) resulting in oppositely charged dilepton final states with accompanying jets. Using 9.7 fb^-1 of integrated luminosity collected with the D0 detector, we find the asymmetries in lepton pseudorapidity compatible with predictions based on the standard model.