QCD corrections to spin correlations in top quark production at lepton colliders

Spin correlations, using a generic spin basis, are investigated to leading order in QCD for top quark production at lepton colliders. Even though these radiative corrections induce an anomalous $\gamma /Z$ magnetic moment for the top quarks and allow for single real gluon emission, their effects on the top quark spin orientation are very small. The final results are that the top quarks (or top antiquarks) are produced in an essentially unique spin configuration in polarized lepton collisions even after including the $\mathcal{O}\left({\alpha }_s\right)$ QCD corrections.