  Electroweak Baryogenesis, given a first order phase transition, does not work
in the standard model because the quark Yukawa matrices are too hierarchical.
On the other hand, the neutrino mass matrix is apparently not hierarchical. In
models with neutrino mass generation at low scales, the neutrino Yukawa
couplings lead to large CP-violation in the reflection probability of heavy
leptons by the expanding Higgs bubble wall, and can generate the observed
baryon asymmetry of the universe. The mechanism predicts new vector-like
leptons below the TeV scale and sizable mu -> e processes.
