摘要
The forward-backward asymmetry in top-pair production that was observed in 2008 gets a boost in a recent CDF publication. Not only has the forward-backward asymmetry been further confirmed, but also distributional preferences are shown. Strikingly, the forward-backward asymmetry is the most sizable in the large M tt̄ invariant mass region and in the large rapidity difference |Δy| region. Here we used our previously proposed t-channel exchanged W ′ boson to explain the new observations. We show that a new particle exchanged in the t channel generically gives rise to such observations. Furthermore, we show that the proposed W ′ can be directly produced in association with a top quark at the Tevatron and the LHC. We perform a signal-background analysis and show that such a W ′ is readily observed at the Tevatron with a 10fb - 1 luminosity and at the LHC-7 with just a 100pb - 1 luminosity. © 2011 American Physical Society.