We propose a mechanism in which the baryon asymmetry of the Universe is produced in out-of-equilibrium, B-L and CP violating scattering processes that convert ordinary particles into particles of some hidden sector. The same mechanism should produce a non-zero asymmetry also in the hidden sector particles and thus the latter could provide a natural candidate for the dark matter. We discuss the example of the hidden mirror sector sector, which also provides a natural framework for the sterile neutrinos, and consider the processes lφ→l'φ', l'-barφ'-bar mediated by the heavy Majorana neutrinos N of the seesaw mechanism, where l and φ are ordinary lepton and Higgs doublets and l', φ' their hidden counterparts.
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