Baryogenesis via neutrino oscillations

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.

RevTex, 5 pages. Following the referee's suggestion the lepton asymmetry re-derived in the density matrix formalism. Results unchanged. Version to be published in Phys. Rev. Lett

References in corpus (1)

• Electroweak Baryon Number Non-Conservation in the Early Universe and in High Energy Collisions

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