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We present a complete next-to-leading order (NLO) QCD calculation to a heavyresonance production and decay into a top quark pair at the LHC, where theresonance could be either a Randall-Sundrum (RS) Kaluza-Klein (KK) graviton $G$or an extra gauge boson $Z'$. The complete NLO QCD corrections can enhance thetotal cross sections by about $80\%- 100\%$ and $20\%- 40\%$ for the $G$ andthe $Z'$, respectively, depending on the resonance mass. We also explore indetail the NLO corrections to the polar angle distributions of the top quark,and our results show that the shapes of the NLO distributions can be differentfrom the leading order (LO) ones for the KK graviton. Moreover, we study theNLO corrections to the spin correlations of the top quark pair production viathe above process, and find that the corrections are small.

Next-to-leading order QCD corrections to a heavy resonance production and decay into top quark pair at the LHC