  I study phenomenological aspects of the SU(2)L x U(1) electroweak physics of
a Higgs boson transforming like a quark-antiquark pair. A correspondence is
established between its flavour content, the hierarchy of quark condensates,
and the leptonic decay constants f of pseudoscalar mesons; the Higgs-mesons
couplings coming from the symmetry-breaking scalar potential can then be
expressed in terms of the f's, of the Cabibbo-Kobayashi-Maskawa mixing angles,
and of the mass of the Higgs boson. Application is made to the decays of a Z
boson into two leptons and two charged pseudoscalar mesons, more specially
$e^+e^- B^+B^-, e^+e^- D_s^+D_s^-$ and $e^+e^- K^\pm \pi^\mp$; the last
channel, involving new types of flavour changing neutral currents in the scalar
sector, is characteristic of this approach. Unlike in the standard model for
quarks, the detection of two outgoing charged $B$ mesons is hopeless, like,
unfortunately, that of $K^\pm \pi^\mp$; the channel $D_s^+ D_s^-$ could have
been missed in present experiments for a Higgs mass lower than $65 GeV$ because
of insufficient statistics. For higher masses this Higgs becomes undetectable
from such channels. This shows that too drastic conclusions should not be drawn
from an eventual negative outcome from searches for the standard Higgs boson,
that simple variants of it are more elusive, may have escaped detection, and
could still escape in the near future.
