Forward-backward asymmetry of top quark in diquark models

Authors:
  • AAAbdesslam Arhrib
    Abdesslam Arhrib
  • RBRachid Benbrik
    Rachid Benbrik
  • CCChuan-Hung Chen
    Chuan-Hung Chen
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Abstract
Motivated by the recent unexpected large forward-backward asymmetry (FBA) of the top quark observed by D$\O$ and CDF at the Tevatron, we investigate a possible explanation for the anomaly within the framework of diquark models. Unlike other mechanisms induced by s-channel or t-channel, the top-quark pair production in the diquark models is dictated by the u-channel diagram. We find that the color-triplet diquark can generate the FBA of 20% when the constraint from the cross section of the top-quark pair production is taken into account.