Fermion mass effects on ${Γ(Z\ra b\bar{b} + a~light~Higgs)}$ in a two-Higgs-doublet model

Large fermion mass effect on the Yukawa process $Z \ra b\bar{b}\ra b\bar{b} h (A)$ in the entire range of the neutral Higgs boson masses is found. It is particularly important for light Higgs bosons, which are still not excluded experimentally in a general two-Higgs-doublet model.