  The Standard Model of electroweak interactions is shown to include a gauge
theory for the observed scalar and pseudoscalar mesons. This is done by
exploiting the consequences of embedding the SU(2)left X U(1) group into the
chiral group of strong interactions and by considering explicitly the Higgs
boson and its three companions inside the standard scalar 4-plet as composite.
No extra scale of interaction is needed. Quantizing by the Feynman path
integral reveals how, in the `Nambu Jona-Lasinio approximation', the quarks and
the Higgs boson become unobservable, and the theory anomaly-free. Nevertheless,
the `anomalous' couplings of the pseudoscalar mesons to gauge fields spring
again from the constraints associated with their compositeness itself. This
work is the complement of a previous one, ref.[1], where the leptonic sector
was shown to be compatible with a purely vectorial theory and, consequently, to
be also anomaly-free. The bond between quarks and leptons loosens.
