Abstract
We propose a new mechanism of leptogenesis in which the asymmetries in lepton
numbers are produced through the CP-violating oscillations of ``sterile''
(electroweak singlet) neutrinos. The asymmetry is communicated from singlet
neutrinos to ordinary leptons through their Yukawa couplings. The lepton
asymmetry is then reprocessed into baryon asymmetry by electroweak sphalerons.
We show that the observed value of baryon asymmetry can be generated in this
way, and the masses of ordinary neutrinos induced by the seesaw mechanism are
in the astrophysically and cosmologically interesting range. Except for singlet
neutrinos, no physics beyond the Standard Model is required.
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