Top Quark Forward-Backward Asymmetry

TL;DR

This paper investigates the observed top quark forward-backward asymmetry deviation from the Standard Model, proposing a W' boson model that explains the anomaly without conflicting with existing cross section measurements.

Contribution

It introduces a W' boson model coupling to down and top quarks, identifying parameter space that accounts for the asymmetry while maintaining consistency with observed cross sections.

Findings

W' boson model can produce the observed asymmetry

Parameter space identified for the W' boson

Discussion of alternative models in literature

Abstract

The recent forward-backward asymmetry recorded by the CDF Collaboration for the top and anti-top quark pair production indicates more than $2\sigma$ deviation from the Standard Model prediction, while its total production cross section remains consistent. We propose a $W'$ boson that couples to down and top quarks. We identify the parameter space that can give rise a large enough forward-backward asymmetry without producing too many top and anti-top quark pairs. Other models presented erstwhile in the literature that can produce such effects are also discussed.