  By analogy with the Ginzburg-Landau theory of multi-band superconductors with
inner (interband) Josephson couplings we formulate the three-band
Glashow-Weinberg-Salam model with weak Josephson couplings between strongly
asymmetrical condensates of scalar (Higgs) fields. Unlike usual single-band
model, we found three Higgs bosons corresponding to three generations of
particles, moreover the heaviest of them corresponds to the already discovered
H-boson from the single-band theory and decay into fermions of only the third
generation. The other two decay into fermions of the first and second
generations accordingly, but they are difficult to observe due to very poor
conditions for production. We found two sterile ultra-light Leggett bosons, the
Bose condensates of which form the dark halos of galaxies and their clusters
(i.e so called "dark matter"). The masses of the Leggett bosons are determined
by the coefficient of the interband coupling and can be arbitrarily small
($\sim 10^{-20}\mathrm{eV}$) due to non-perturbativeness of the interband
coupling. Since propagation of Leggett bosons is not accompanied by current,
these bosons are not absorbed by gauge fields unlike the common-mode Goldstone
bosons. Three coupled condensates of the scalar fields causes the existence of
three generations of leptons, where each generation interacts with the
corresponding condensate getting mass. The interflavour mixing between the
generations of active neutrinos and sterile right-handed neutrinos in the
three-band system causes the existence of mass states of neutrino without
interaction with the Higgs condensates.
