Baryogenesis via neutrino oscillations

Details Baryogenesis via neutrino oscillations Baryogenesis via neutrino oscillations

1998-03-05

arxiv.org/abs/hep-ph/9803255v2

Phys.Rev.Lett.81:1359-1362,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTex, 5 pages. Following the referee's suggestion the lepton asymmetry re-derived in the density matrix formalism. Results u

Scientific paper

10.1103/PhysRevLett.81.1359

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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