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 language | English |
|---|---|
| Article number | 073009 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 77 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2008 Apr 25 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Mathematical Physics
Cite this
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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 journal › Article
TY - JOUR
T1 - Leptogenesis in a seesaw model with Fritzsch-type lepton mass matrices
AU - Ahn, Y. H.
AU - Kang, Sin Kyu
AU - Kim, Choong Sun
AU - Lee, Jake
PY - 2008/4/25
Y1 - 2008/4/25
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevD.77.073009
DO - 10.1103/PhysRevD.77.073009
M3 - Article
AN - SCOPUS:42649084698
VL - 77
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 1550-7998
IS - 7
M1 - 073009
ER -