Neutral Heavy Leptons and Electroweak Baryogenesis

Abstract

We investigate the possibility that baryogenesis occurs during the weak phase transition in a minimal extension of the Standard Model which contains extra neutral leptons and conserves total lepton number. The necessary CP-violating phases appear in the leptonic Yukawa couplings. We compute the CP-asymmetries in both the neutral and the charged lepton fluxes reflected on the bubble wall. Using present experimental bounds on the mixing angles and Standard Model estimates for the parameters related to the scalar potential, we conclude that it seems unlikely to produce the observed baryon to entropy ratio within this type of models. We comment on the possibility that the constraints on the mixings might be naturally relaxed due to small finite temperature effects.

21 pages (4 Figures)

Cited by in corpus (9)

• Electroweak Resonant Leptogenesis in the Singlet Majoron Model
• Supersymmetric Electroweak Baryogenesis
• Soft leptogenesis in the inverse seesaw model
• Electroweak Phase Transitions in left-right symmetric models
• Electroweak Baryogenesis from Late Neutrino Masses
• Electroweak Baryogenesis Using Baryon Number Carrying Scalars
• $\nu$ Electroweak Baryogenesis: The Scalar Singlet Strikes Back
• Cosmic matter from dark electroweak phase transition with neutrino mass generation
• $\nu$ Electroweak Baryogenesis