Tevatron asymmetry of tops in a W′, Z′ model

Recent results from the CDF Collaboration indicate that the top-pair forward-backward asymmetry is largest in regions of high rapidity difference |Δy| and invariant mass Mtt¯. We show that experimental observations can be explained by our previously proposed Asymmetric Left-Right Model (ALRM). The gauge symmetry U′(1)×SU′(2)×SU(2) is broken by a triplet Higgs in the primed sector. The W′ boson has a (t,d) right-handed coupling and the Z′ boson has diagonal fermion couplings. We determine the model parameters to be MW′=700GeV, MZ′=1TeV, and charged current coupling g2′=3. The W′ and Z′ total decay widths are of O(100GeV). The signals from Z′→tt¯ and W′→tb at the LHC will test the model.