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

Abstract

The forward-backward asymmetry (FBA) in top-pair production that was observed in 2008 gets a boost in a recent CDF publication. Not only has the FBA further been confirmed, but also distributional preferences are shown. Strikingly, the FBA is the most sizable in the large $M_{t\bar{t}}$ invariant mass region and in the large rapidity difference $|\Delta y|$ region. Here we used our previously proposed $t$-channel exchanged $W^{\prime }$ 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 $W^{\prime }$ 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 $W^{\prime }$ is readily observed at the Tevatron with a 10 fb${}^{-1}$ luminosity and at the LHC-7 with just a 100 pb${}^{-1}$ luminosity.

A whole new section about implications at the Tevatron and the LHC is added. A few new references. 15 pages, 5 figures

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