Leptogenesis and neutrino oscillations within a predictive G(224)/SO(10) framework
2003; American Physical Society; Volume: 68; Issue: 7 Linguagem: Inglês
10.1103/physrevd.68.072002
ISSN1538-4500
Autores Tópico(s)Dark Matter and Cosmic Phenomena
ResumoA framework based on an effective symmetry that is either $\mathrm{G}(224)=\mathrm{SU}{(2)}_{L}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(2)}_{R}\ifmmode\times\else\texttimes\fi{}\mathrm{SU}{(4)}^{c}$ or SO(10) has been proposed (a few years ago) that successfully describes the masses and mixings of all fermions including neutrinos, with seven predictions, in good accord with the data. Baryogenesis via leptogenesis is considered within this framework by allowing for natural phases $(\ensuremath{\sim}1/20--1/2)$ in the entries of the Dirac and Majorana mass matrices. It is shown that the framework leads quite naturally, for both thermal as well as nonthermal leptogenesis, to the desired magnitude for the baryon asymmetry. This result is obtained in full accord with the observed features of the atmospheric and solar neutrino oscillations, as well as with those of the quark and charged lepton masses and mixings, and the gravitino constraint. Hereby one obtains a unified description of fermion masses, neutrino oscillations and baryogenesis (via leptogenesis) within a single predictive framework.
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