We study top-antitop pair production and top spin correlations in a model with an electrically neutral massive gauge boson, Z, at the Large Hadron Collider. In addition to the Standard Model processes, the Z contributes to the top-antitop pair production process in the s-channel. Choosing a kinematical region of top invariant mass around the Z resonance pole, we find sizable deviations of the top-antitop pair production cross section and the top spin correlations from those of the Standard Model.
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