In order to explain the Tevatron anomaly of the top quark forward-backward
asymmetry AFBt in the left-right twin Higgs model, we choose to give up
the lightest neutral particle of h^ field as a stable dark matter
candidate. Then a new Yukawa interaction for h^ is allowed, which can be
free from the constraint of same-sign top pair production and contribute
sizably to AFBt. Considering the constraints from the production rates of
the top pair (ttˉ), the top decay rates and ttˉ invariant mass
distribution, we find that this model with such new Yukawa interaction can
explain AFBt measured at the Tevatron while satisfying the charge
asymmetry ACt measured at the LHC.Moreover, this model predicts a
strongly correlation between ACt at the LHC and AFBt at the
Tevatron, i.e., ACt increases as AFBt increases.Comment: 17 pages, 9 figures; matches the published versio