Tevatron Asymmetry of Tops in a W',Z' Model

Recent results from the CDF Collaboration indicate the the top-pair forward-backward asymmetry is largest in regions of high rapidity difference $\mathrm{\mid }\mathrm{\Delta }y\mathrm{\mid }$ and invariant mass $M_{t\bar{t}}\mathrm{.}$ We show that experimental observations can be explained by our previously proposed Asymmetric Left-Right Model (ALRM). The gauge symmetry $U^{\mathrm{\prime }}(1)\times S{U}^{\mathrm{\prime }}(2)\times SU(2)$ is broken by a triplet Higgs in the primed sector. The $W^{\mathrm{\prime }}$ boson has a $(t,d)$ right-handed coupling and the $Z^{\mathrm{\prime }}$ boson has diagonal fermion couplings. We determine the model parameters to be $M_{W^{\mathrm{\prime }}}=700$ GeV, $M_{Z^{\mathrm{\prime }}}=1$ TeV, and charged current coupling $g_2^{\mathrm{\prime }}=3$. The $W^{\mathrm{\prime }}$ and $Z^{\mathrm{\prime }}$ total decay widths are of $\mathcal{O}(100$ GeV). The signals from $Z^{\mathrm{\prime }}\to t\bar{t}$ and $W^{\mathrm{\prime }}\to tb$ at the LHC will test the model.