Forward-backward asymmetry of the top quark in diquark models

Motivated by the recent unexpected large forward-backward asymmetry of the top-quark observed by D0 and CDF at the Tevatron, we investigate a possible explanation for the anomaly within the framework of diquark models. In the diquark models, the top-quark pair production is mediated by the $u$-channel diagram. It is found that the color-triplet diquark can generate the forward-backward asymmetry of 20% when the constraint from the cross section of the top-quark pair production is taken into account. DOI: http://dx.doi.org/10.1103/PhysRevD.82.034034 © 2010 The American Physical Society