TREE LEVEL T-]CH(O) OR H(O)-]T(C)OVER-BAR DECAYS

In a third type of two Higgs model, where neutral scalar bosons possess flavor changing u(i)u(j)h0 couplings proportional to square-root m(i)m(j), low energy constraints are evaded. With the top as the heaviest fermion, tree level flavor changing t --> ch0 or h0 --> tcBAR decays may be competitive with, if not dominant over, the corresponding t --> bW* or h0 --> bbBAR decays. The CDF limit of m(t) > 91 GeV may be evaded by the t --> ch0 mode if m(h)0 < m(t) < M(W), while the h0 --> tcBAR mode may be useful for the study of intermediate mass Higgs bosons at hadronic supercolliders. The scenario can be distinguished from the existence of exotic quarks since flavor changing Z couplings are absent.