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We present the complete next-to-leading order (NLO) QCD corrections to $tZ$associated production induced by the model-independent $tqg$ and $tqZ$flavor-changing neutral-current couplings at hadron colliders, respectively.Our results show that, for the $tuZ$ coupling the NLO QCD corrections canenhance the total cross sections by about 60% and 42%, and for the $tcZ$coupling by about 51% and 43% at the Tevatron and LHC, respectively. The NLOcorrections, for the $tug$ couplings, can enhance the total cross sections byabout 27%, and by about 42% for the $tcg$ coupling at the LHC. We also considerthe mixing effects between the $tqg$ and $tqZ$ couplings for this process,which can either be large or small depending on the values of the anomalouscouplings. Besides, the NLO corrections reduce the dependence of the totalcross sections on the renormalization or factorization scale significantly,which lead to increased confidence on the theoretical predictions. And we alsoevaluate the NLO corrections to several important kinematic distributions.

Next-to-leading order QCD corrections to $tZ$ associated production via the flavor-changing neutral-current couplings at hadron colliders