Top quark asymmetry and dijet resonances

TL;DR

This paper explores whether a flavor-changing vector resonance can explain the dijet mass anomaly observed with a W boson and the top quark forward-backward asymmetry, proposing a new physics scenario consistent with existing constraints.

Contribution

It introduces a flavor-changing vector resonance model that accounts for both the dijet anomaly and top quark asymmetry, which previous models could not simultaneously explain.

Findings

A flavor-changing $u-t-V$ coupling can explain the dijet anomaly.

The model is consistent with other resonance search constraints.

It offers a potential explanation for the top quark forward-backward asymmetry.

Abstract

CDF recently reported an anomaly in the $m_{jj}$ distribution of dijet events produced in association with a $W$ boson. If this anomaly is associated with a new flavor conserving vector resonance, $V$, one might have expected to observe effects in the analogous $m_{jj}$ distribution produced in association with a $\gamma$. No such excess is observed. A single $u-t-V$ flavor changing coupling, however, can contribute to the $m_{jj}$ anomaly while being consistent with other resonance searches. Furthermore, it gives a potential explanation of the observed forward-backward asymmetry in top quark production.