The forward-backward asymmetry measurement in top-pair production at the Tevatron is about 2σ from the standard model prediction. We propose an asymmetric left-right model, which includes a W^' boson with a right-handed coupling of down to top quark, and a Z^' boson with diagonal couplings to the up, top, and down quarks with M_W^'≈175 GeV and M_Z^'≈900 GeV. The model accounts for the asymmetry while remaining consistent with the top-pair total cross section and invariant mass distribution.
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Barger et al. (2010) studied this question.
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