The $O\left(\frac{\alpha m_t^2}{m_W^2}\right)$ Yukawa corrections to bottom quark pair production via photon-photon fusion in TeV $e^{+}{e}^{-}$ colliders are calculated in both the general two-Higgs-doublet model and minimal supersymmetric model. We find that the corrections to the cross section of the subprocess $\gamma \gamma \to b\overline{b}$ can be a few percent. The corrections to the total cross section of the process $e^{+}{e}^{-}\to \gamma \gamma \to b\overline{b}$ in the beamstrahlung photon fusion mode are rather small and can be ignored at the one-loop level; however, the corrections in the Compton backscattering photon fusion mode may approach 0.1% for favorable parameter values.

• Received 26 September 1995

DOI:https://doi.org/10.1103/PhysRevD.54.2363