Top quark forward-backward asymmetry and W^prime bosons

TL;DR

This paper investigates a W' boson model as a possible explanation for the top quark forward-backward asymmetry anomaly at the Tevatron, using LHC data to constrain the model's parameters and assess its viability.

Contribution

It introduces a W' boson model linking Tevatron asymmetry to LHC constraints, providing a new approach to test this beyond-standard-model explanation.

Findings

W' boson production would lead to additional tt̄+jets events at LHC.

LHC measurements constrain W' couplings at 95% confidence level.

W' model could be fully excluded with 5 fb^{-1} of data.

Abstract

The top quark forward-backward asymmetry measured at the Fermilab Tevatron collider deviates from the standard model prediction. A W^prime boson model is described, where the coupling W^prime-t-d is fixed by the tt_bar forward-backward asymmetry and total cross section at the Tevatron. We show that such a W^prime boson would be produced in association with a top quark at the CERN Large Hadron Collider (LHC), thus inducing additional tt_bar+j events. We use measurements of tt_bar+n-jet production from the LHC to constrain the allowed W^prime-t-d couplings as a function of W^prime boson mass. We find that this W^prime model is constrained at the 95% C.L. using 0.7 fb^{-1} of data from the LHC, and could be fully excluded with 5 fb^{-1} of data.