One-loop QCD and electroweak corrections to t(t)over-barZ0 production at an e+e- linear collider

We study the impact of the full O(alpha(s)) QCD and O(alpha(ew)) electroweak (EW) radiative corrections to the e(+)e(-) -> t (t) over barZ(0) process in the standard model, and investigate the dependence of the lowest-order (LO), one-loop QCD and EW corrected cross sections on colliding energy root s. The LO, QCD and EW corrected spectrums of the invariant mass of t (t) over bar pair and the distributions of the transverse momenta of final top quark and Z(0) boson are presented. The numerical results show that the one-loop QCD correction enhances the LO cross section, but the EW one-loop correction generally suppresses the LO cross section with our chosen parameters. In the case of m(H) = 120 GeV, the QCD relative corrections can reach 43.16% when root s = 500 GeV, while the EW relative corrections have the values of -9.24%, -4.36% and -5.81%, when root s = 500 GeV, 800 GeV, 1.2 TeV, respectively.