In order to explain the Tevatron anomaly of the top quark forward-backward asymmetry $A_{ FB}^t$ in the left-right twin Higgs model, we choose to give up the lightest neutral particle of $\hat{ h}$ field as a stable dark matter candidate. Then a new Yukawa interaction for $\hat{ h}$ is allowed, which can be free from the constraint of same-sign top pair production and contribute sizably to $A_{ FB}^t$. Considering the constraints from the production rates of the top pair ($t\bar t$), the top decay rates and $t\bar{ t}$ invariant mass distribution, we find that this model with such new Yukawa interaction can explain $A_{ FB}^t$ measured at the Tevatron while satisfying the charge asymmetry $A_{ C}^t$ measured at the LHC.Moreover, this model predicts a strongly correlation between $A_{ C}^t$ at the LHC and $A_{ FB}^t$ at the Tevatron, i.e., $A_{ C}^t$ increases as $A_{ FB}^t$ increases.
Categories: hep-ph