Understand
We argue that the $t \bar t$ production asymmetry observed at the tevatron might be simply explained if the standard $SU(3)_c$ QCD theory is extended to $SU(N_c)$ 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 $N_c \stackrel{>}{\sim} 5$.
- This explanation requires a relatively low $SU(N_c)$ symmetry breaking scale $\stackrel{<}{\sim} 0.5-1$ TeV.
- We check that such a low $SU(N_c)$ symmetry breaking scale is consistent with current collider data.
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