  After developing in ref.[1] a SU(2)left x U(1) gauge theory for J=0 mesons, I
show in the case of two generations that: - the electroweak mass eigenstates
differ, especially in the K and D sector, from what they are assumed to be on
the basis of a classification by the SU(4) group of flavour; - a new mechanism
for CP violation springs out, different from that of the standard model for
quarks which requires at least three generations, and I construct a SU(2)left x
U(1) gauge invariant Lagrangian which is not invariant by CP.
