Leptogenesis in a seesaw model with Fritzsch-type lepton mass matrices

Y. H. Ahn, Sin Kyu Kang, Choong Sun Kim, Jake Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We investigate how the baryon asymmetry of our Universe via leptogenesis can be achieved within the framework of the seesaw model with Fritzsch-type lepton mass matrices proposed by Fukugita et al. We study the cases with CP-violating phases in charged-lepton Yukawa matrix, however, with and without Dirac neutrino Yukawa phases. We consider both flavor-independent and flavor-dependent leptogenesis, and demonstrate how they lead to different amounts of lepton asymmetries in detail. In particular, it is shown that flavor-dependent leptogenesis in this model can be achieved only for very tiny or zero values of CP phases in Dirac neutrino Yukawa matrix at the grand unified theory scale. In addition to the CP phases, for successful leptogenesis in the model it is required that the degeneracy of the heavy Majorana neutrino mass spectrum should be broken and we also show that the breakdown of the degeneracy can be radiatively induced.

Original languageEnglish
Article number073009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume77
Issue number7
DOIs
Publication statusPublished - 2008 Apr 25

Fingerprint

leptons
neutrinos
matrices
Degeneracy
asymmetry
Neutrinos
Paul Adrien Maurice Dirac
Asymmetry
grand unified theory
mass spectra
Dependent
baryons
Neutrino Mass
Baryon
universe
breakdown
Model
Breakdown
Zero
Demonstrate

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

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abstract = "We investigate how the baryon asymmetry of our Universe via leptogenesis can be achieved within the framework of the seesaw model with Fritzsch-type lepton mass matrices proposed by Fukugita et al. We study the cases with CP-violating phases in charged-lepton Yukawa matrix, however, with and without Dirac neutrino Yukawa phases. We consider both flavor-independent and flavor-dependent leptogenesis, and demonstrate how they lead to different amounts of lepton asymmetries in detail. In particular, it is shown that flavor-dependent leptogenesis in this model can be achieved only for very tiny or zero values of CP phases in Dirac neutrino Yukawa matrix at the grand unified theory scale. In addition to the CP phases, for successful leptogenesis in the model it is required that the degeneracy of the heavy Majorana neutrino mass spectrum should be broken and we also show that the breakdown of the degeneracy can be radiatively induced.",
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Leptogenesis in a seesaw model with Fritzsch-type lepton mass matrices. / Ahn, Y. H.; Kang, Sin Kyu; Kim, Choong Sun; Lee, Jake.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 77, No. 7, 073009, 25.04.2008.

Research output: Contribution to journalArticle

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