Bi-large Neutrino Mixing See-Saw Mass Matrix with Texture Zeros and Leptogenesis |
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| Authors: | CHAO Wei HE Xiao-Gang LI Xue-Qian |
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| Affiliation: | 1. Department of Physics, Nankai University, Tianjin 300071, China;2. NCTS/TPE, Department of Physics, National Taiwan University, Taipei, China |
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| Abstract: | We study constraints on neutrino properties for a class of bi-large mixing See-Saw mass matrices with texture zeros and with the related Dirac neutrino mass matrix to be proportional to a diagonal matrix of the form diag(ε,1,1). Texture zerosmay 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 withat 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 and mixing. None of the neutrinos can have zero masses and the lightest of the light neutrinos has amass larger than about 0.046 eV for class a and 0.0027 eV for class b. In these models although the CKM CP violating phase vanishes, the non-zero Majorana phases can exist and can play an important role in producing the observed baryon asymmetry in ouruniverse through leptogenesis mechanism. The requirement ofproducing the observed baryon asymmetry can further distinguishdifferent models and also restrict the See-Saw scale to be in therange of 1012～1015 GeV. We also discuss RG effects on V13. |
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| Keywords: | neutrino neutrino mass matrix neutrino masses and mixing bi-large mixing matrix |
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