In the left-right asymmetry model, differing neutron and antineutron lifetimes during the QCD phase transition generate baryon asymmetry while escaping sterile neutrinos produce opposite lepton asymmetry.
This may occur somewhat ahead of nucleon formation, as neutral mesons consist of two quarks, which can be heavier that those contained in nucleons
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Baryon and lepton asymmetry of the Universe in the left-right asymmetry model of weak interaction
In the left-right asymmetry model, differing neutron and antineutron lifetimes during the QCD phase transition generate baryon asymmetry while escaping sterile neutrinos produce opposite lepton asymmetry.