B-]S-GAMMA AND Z-]B(B)OVER-BAR IN TECHNICOLOR WITH SCALARS

We consider the radiative decay b --> s gamma, and the correction to the Zb $$($) over bar b vertex in technicolor models with scalars. In these models, the scalar develops a vacuum expectation value when the technifermions condense, and the ordinary fermions develop masses via Yukawa couplings. Since the symmetry breaking sector involves both a fundamental scalar doublet and an isotriplet of composite scalars (the technipions), the phenomenology associated with the charged scalars is similar to that found in a type-I two-Higgs doublet model. We show that the correction to the Zb $$($) over bar b vertex is small over the allowed parameter space of the model in the two limits that we consider, and that there can be large, potentially observable, contributions to the b --> s gamma branching fraction.