  We present an approach for particle mass generation in which the physical
vacuum is assumed as a medium at zero temperature and where the dynamics of the
vacuum is described by the Standard Model without the Higgs sector. In this
approach fermions acquire masses from interactions with vacuum and gauge bosons
from charge fluctuations of vacuum. The obtained results are consistent with
the physical mass spectrum, in such a manner that left-handed neutrinos are
massive. Masses of electroweak gauge bosons are properly predicted in terms of
experimental fermion masses and running coupling constants of strong,
electromagnetic and weak interactions. An existing empirical relation between
the top quark mass and the electroweak gauge boson masses is explained by means
of this approach.
