Asymmetric left-right model and the top pair forward-backward asymmetry

The forward-backward asymmetry measurement in top-pair production at the Tevatron is about 2 sigma 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' approximate to 175 GeV and M-Z' approximate to 900 GeV. The model accounts for the asymmetry while remaining consistent with the top-pair total cross section and invariant mass distribution.