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We investigate the new contributions to the parameters $g_L$ and $g_R$ of the$Z b \bar b$ vertex in a multi-Higgs-doublet model (MHDM). We emphasize thatthose contributions generally worsen the fit of those parameters to theexperimental data. We propose a solution to this problem, wherein $g_R$ has theopposite sign from the one predicted by the Standard Model; this solution,though, necessitates light scalars and large Yukawa couplings in the MHDM.

Fitting the $Z b \bar b$ vertex in the two-Higgs-doublet model and in the three-Higgs-doublet model