Baryogenesis via leptogenesis from quark-lepton symmetry and a compact heavy N{sub R} spectrum
- Dipartimento di Scienze Fisiche, Universita di Napoli, Via Cintia, Napoli (Italy)
- Italy
By demanding a compact spectrum for the right-handed neutrinos and an approximate quark-lepton symmetry inspired from SO(10) gauge unification (assuming a Dirac neutrino mass matrix close to the up quark mass matrix), we construct a fine-tuning scenario for baryogenesis via leptogenesis. We find two solutions with a normal hierarchy, with the lightest neutrino mass m{sub 1} different from zero, providing an absolute scale for the spectrum. In the approximations of the model, there are three independent CP phases: {delta}{sub L} (that we take of the order of the quark Kobayashi-Maskawa phase) and the two light neutrino Majorana phases {alpha} and {beta}. A main conclusion is that, although this general scheme is rather flexible, in some regions of parameter space we find that the necessary baryogenesis with its sign is given in terms of the {delta}{sub L} phase alone. The light Majorana phases can also be computed, and they turn out to be close to {pi}/2 or very small. Moreover, SO(10) breaks down to the Pati-Salam group SU(4)xSU(2)xSU(2) at the expected natural intermediate scale of about 10{sup 10}-10{sup 11} GeV. A prediction is made for the effective mass in ({beta}{beta}){sub 0{nu}} decay, the {nu}{sub e} mass, and the sum of all light neutrino masses.
- OSTI ID:
- 21541586
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
APPROXIMATIONS
CALCULATION METHODS
DECAY
EEV RANGE
EFFECTIVE MASS
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORECASTING
GAUGE INVARIANCE
INVARIANCE PRINCIPLES
KOBAYASHI-MASKAWA MATRIX
LEPTONS
LIE GROUPS
MAJORANA THEORY
MASS
MASSLESS PARTICLES
MATRICES
NEUTRINOS
PARTICLE DECAY
PARTICLE PRODUCTION
QUARKS
SO GROUPS
SO-10 GROUPS
SPECTRA
SU GROUPS
SU-2 GROUPS
SU-4 GROUPS
SYMMETRY
SYMMETRY BREAKING
SYMMETRY GROUPS
U QUARKS