Top quark forward-backward asymmetry from SU(Nc) color

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We argue that the t t production asymmetry observed at the tevatron might be simply explained if the standard SU(3)c QCD theory is extended to SU(Nc) which is spontaneously broken at a scale just above the weak scale. The extended gauge interactions amplify the radiative QCD contribution to the asymmetry and can potentially explain the observations if Nc > 5. This explanation requires a relatively low SU(Nc) symmetry breaking scale < 0.5-1 TeV. We check that such a low SU(Nc) symmetry breaking scale is consistent with current collider data. Importantly this scenario predicts an abundance of striking phenomena which will be probed at the LHC. The SU(Nc) model also illustrates the idea that a beyond standard model contribution to the t t asymmetry might arise primarily via radiative corrections rather than at tree-level.