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

We calculate Yukawa corrections of order αew{M}ₜ²/MW² to single top-quark production via qq̄^'{→}tb̄ at the Fermilab Tevatron in the two-Higgs-doublet models. In our calculation we also keep the terms proportional to Mb² tan²{β} since their effects may become rather important for large tan{β}. 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.