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We examine loop-mediated effects of new heavy quarks Q=(t',b') on t tbarproduction at hadron colliders, using a phenomenological model with flavoroff-diagonal couplings of charged and neutral scalars phi=(phi^+-,phi^0) to Q.We show that an invariant-mass-dependent asymmetry, in the t tbar center ofmass, consistent with those recently reported by the CDF collaboration can beobtained for quark masses around 350-500 GeV, scalar masses of order 100-200GeV, and modest to strong Yukawa couplings. The requisite strong interactionssuggest a non-perturbative electroweak symmetry breaking mechanism andcomposite states at the weak scale. A typical prediction of this framework isthat the new heavy quarks decay dominantly into t phi final states.

Top Pair Forward-Backward Asymmetry from Loops of New Strongly Coupled Quarks