Search

The improved standard model prediction for total top quark forward-backward asymmetry of 8.9% at the Tevatron has significantly reduced the long-term discrepancy between the theory value and the experimental observations. The seemingly "last" over-3 &sgr; anomaly is the CDF measurement of AFB(Mū→ 450 GeV) and it is not seen by the D0 Collaboration. In this paper, we take the CDF measurement to obtain the best-fit parameter space for various previously proposed models, including axigluon, t-channel neutral current, charged current, and diquark models, then study the predictions of the corresponding parameter space on the direct search or indirect constrain. The particular axigluon model is excluded by the LHC dijet search. The t-channel Z' model suffer from the Tevatron same-sign dilepton search bound. The t-channel W model and the diquark model both predict significant increase in the production rate of inclusive t&tmacr; search at the LHC which is not seen. We conclude none of the models are favored by the direct search bound. [ABSTRACT FROM AUTHOR]