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The forward-backward asymmetry (FBA) in top-pair production that was observedin 2008 gets a boost in a recent CDF publication. Not only has the FBA furtherbeen confirmed, but also distributional preferences are shown. Strikingly, theFBA is the most sizable in the large $M_{t\bar t}$ invariant mass region and inthe large rapidity difference $|\Delta y|$ region. Here we used our previouslyproposed $t$-channel exchanged $W'$ boson to explain the new observations. Weshow that a new particle exchanged in the $t$-channel generically gives rise tosuch observations. Furthermore, we show that the proposed $W'$ can be directlyproduced in association with a top quark at the Tevatron and the LHC. Weperform a signal-background analysis and show that such a $W'$ is readilyobserved at the Tevatron with a 10 fb$^{-1}$ luminosity and at the LHC-7 withjust a 100 pb$^{-1}$ luminosity.

Top Quark Forward-Backward Asymmetry in the Large Invariant Mass Region