  I build a SU(2)left x U(1) electroweak gauge theory of J=0 mesons, which
transform like sets of fermion-antifermion composite fields. SU(2)left x U(1)
is embedded in a natural way, compatible with the Glashow-Salam-Weinberg model
for quarks, into the chiral group U(N)left x U(N)right, N being the (even)
number of ``flavours''. The Lagrangian exhibits a chiral SU(2)left x SU(2)right
symmetry at the limit when the hypercharge coupling g' goes to zero. It is
spontaneously broken down to its diagonal SU(2)v subgroup; as the latter
includes the U(1) group of electromagnetism, this provides an explanation for
the quantization of the electric charge. Comparison with recent works by Cho et
al. unraveling dyon-like solution is an electroweak model with the same
structure suggests that electric-magnetic duality may be realized here, with
the occurrence of a strongly interacting sector. Chiral are electroweak
spontaneous breaking are identical. Consequences for the nature of the
Goldstone bosons are examined. The mass spectrum is analysed. It bears no
special connection with the nature of the ``fermionic content'' of the mesons
and shares with the leptonic sector the same arbitrariness. No information on
the mass of the Higgs boson can be expected without additional input. New
results about CP violation are obtained: ``indirect'' CP violation appears to
results from P violation (unitarity compels the electroweak mass eigenstates to
be C eigenstates), and the role of the Kobayashi-Maskawa mixing matrix for
fermions fades away: mesonic mass eigenstates can still be CP eigenstates
despite the presence of a complex phase. I briefly show how the customary
results for the leptonic decays of pseudoscalar mesons are recovered. The
extension to leptons is discussed.
