Bi-Large Neutrino Mixing See-Saw Mass Matrix with Texture Zeros and Leptogenesis

Details Bi-Large Neutrino Mixing See-Saw Mass Matrix with Texture Zeros and Leptogenesis Bi-Large Neutrino Mixing See-Saw Mass Matrix with Texture Zeros and Leptogenesis

2005-03-30

arxiv.org/abs/hep-ph/0503285v3

Commun.Theor.Phys.45:1073-1084,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

21 pages, 7 figures revised version, some references added, to be submitted to PRD

Scientific paper

10.1088/0253-6102/45/6/023

We study constraints on neutrino properties from texture zeros in bi-large mixing See-Saw mass matrix and also from leptogenesis. Texture zeros may occur in the light (class a)) or in the heavy (class b)) neutrino mass matrices. Each of these two classes has 5 different forms which can produce non-trivial three generation mixing with at least one texture zero. We find that two types of texture zero mass matrices in both class a) and class b) can be consistent with present data on neutrino masses, mixing and produce the observed baryon asymmetry of the universe. None of the neutrinos can have zero masses with the lightest of the light neutrinos having a mass larger than about 0.039 eV for class a) and 0.002 eV for class b). In these models although CKM CP violating phase vanishes, non-zero Majorana phases, however, can exist and play an important role in producing the observed baryon asymmetry in our universe through leptogenesis mechanism. The requirement of producing the observed baryon asymmetry can further distinguish different models and also restrict the See-Saw scale to be in the range $10^{12}\sim 10^{15}$ GeV.

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