  In the scenario of cold electroweak baryogenesis, oscillations of the Higgs
field lead to metastable domains of unbroken phase where the Higgs field nearly
vanishes. Those domains have also been identified with the $W-t-\bar{t}$ bags,
a non-topological soliton made of large number ($\sim 1000$) of gauge quanta
and heavy (top and anti-top) quarks. As real-time numerical studies had shown,
sphalerons (topological transition events violating the baryon number) occur
only inside those bags. In this work we estimate the amount of CP violation in
this scenario coming from the Standard Model, via the Cabibbo-Kobayashi-Maskawa
(CKM) quark mixing matrix, resulting in top-minus-antitop difference of the
population in the bags. Since these tops/anti-tops are "recycled" by
sphalerons, this population difference leads directly to the baryonic asymmetry
of the Universe. We look at the effect appearing in the 4th order in weak $W$
diagrams describing interference of different quark flavor contributions. We
found that there are multiple cancellations of diagrams and clearly
sign-definite effect appears only in the 6th order expansion over
flavor-dependent phases. We then estimate contributions to these diagrams in
which weak interaction occurs (i) inside, (ii) near and (iii) far from the
$W-t-\bar{t}$ b-bags, optimizing the contributions in each of them. We conclude
that the second ("near") scenario is the dominant one, producing CP violation
of the order of $10^{-10}$, in our crude estimates. Together with the baryon
violation rate of about $10^{-2}$, previously demonstrated for this scenario,
it puts the resulting asymmetry close to what is needed to explain the observed
baryonic asymmetry in the Universe. Our answer also has a definite sign, which
apparently seems to be the correct one.
