  We show, in the case of a U(1)L spontaneously broken gauge theory, how
introducing a composite Wess-Zumino field, with a derivative coupling to the
fermionic current, and a composite scalar sector leads to infinitely massive
quarks and Higgs boson, making them unobservable as asymptotic states. This
results from the constraints that need to be introduced in the Feynman path
integral to take into account the non-independent scalar degrees of freedom,
and from the breaking of the symmetry by the non-vanishing vacuum expectation
value of the Higgs boson. Unitarity and gauge invariance are achieved; the
former can be made explicit by "gauging" the Wess-Zumino field into the third
component of the massive gauge boson; the latter is recovered at the level of
Green functions through the cancellation of the non-invariance of the action
with that of the fermionic measure. The compensation of the anomaly can also be
seen as a consequence of the infinite mass of the fermions. The pseudoscalar
partner of the Higgs is shown to behave like an abelian pion, specially as far
are its leptonic decays are concerned; in particular, no extra scale of
interaction is needed, unlike in "technicolour" theories. The correct decay of
the pion into two photons is recovered despite the abscence of anomaly.
Arguments are given in favour of renormalizability. The leptonic sector is the
object of a subsequent work.
