Yukawa corrections to single top-quark production at the Fermilab Tevatron in the two-Higgs-doublet models

We calculate Yukawa corrections of order alpha(EW)M(t)(2)/M(W)(2) to single top-quark production via q<(q')over bar>-->t (b) over bar at the Fermilab Tevatron in the two-Higgs-doublet models. In our calculation we also keep the terms proportional to M(b)(2) tan(2) beta since their effects may become rather important for large tan beta. The corrections can amount to more than a 15% reduction in the production cross section relative to the tree-level result in the general two-Higgs-doublet model, and a 10% enhancement in the minimal supersymmetric model, which might be observable at a high-luminosity Tevatron.