The exchange of a light $t$-channel flavor-changing gauge boson, $V^{\prime }$, with mass $\sim m_{\mathrm{top}}$ remains a leading explanation for the anomalous forward-backward asymmetry in top-quark production at the Tevatron. Unlike other ideas, including heavier $t$-channel mediators, the light $V^{\prime }$ model is not easily seen in the $m_{t\overline{t}}$ distribution. We advocate a more promising strategy. While current analyses at hadron colliders may not be sensitive, we propose searching for a $jj$ resonance in association with single top that may allow discovery in existing data. Deviations in the lepton charge asymmetry in this sample should also be present.

• Received 17 August 2011

DOI:https://doi.org/10.1103/PhysRevD.84.091502