Anomalous Wtb coupling and forward-backward asymmetry of top quark production at the Tevatron

TL;DR

This paper investigates how anomalous Wtb couplings influence the forward-backward asymmetry in top quark pair production at the Tevatron, using a Monte Carlo simulation with an effective Lagrangian including dimension-five terms.

Contribution

It implements the most general effective Wtb interaction into a Monte Carlo program to analyze the impact of anomalous couplings on top quark asymmetries.

Findings

Little effect of tensor form factors on asymmetry

Effective Lagrangian implemented in 'carlomat'

Results show minimal impact on charge-signed lepton rapidity

Abstract

An influence of the anomalous Wtb coupling on forward-backward asymmetry of top quark pair production at the Tevatron is investigated taking into account decays of the top quarks to 6 fermion final states containing one charged lepton. To this end the most general effective Lagrangian of the Wtb interaction containing terms of dimension up to five is implemented into 'carlomat', a general purpose Monte Carlo program, which allows to compute automatically all necessary cross sections in the presence of anomalous vector and tensor form factors. A sample of results which illustrate little effect of the left- and right-handed tensor form factors on the t\bar t invariant mass dependent forward-backward asymmetry and the charge-signed rapidity distribution of the lepton originating from the W boson from top quark decay is shown.