Seesaw mechanism and structure of neutrino mass matrix

被引:35
作者
Akhmedov, EK [1 ]
Branco, GC [1 ]
Rebelo, MN [1 ]
机构
[1] Univ Tecn Lisboa, Dept Fis, CFIF, Inst Super Tecn, P-1049001 Lisbon, Portugal
关键词
neutrino masses and mixing; seesaw mechanism;
D O I
10.1016/S0370-2693(00)00282-3
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We consider the seesaw mechanism of neutrino mass generation in the light of our present knowledge of the neutrino masses and mixing. We analyse the seesaw mechanism constrained by the following assumptions: (1) minimal seesaw with no Higgs triplets, (2) hierarchical Dirac masses of neutrinos, (3) large lepton mixing primarily or solely due to the mixing in the right-handed neutrino sector, and (4) unrelated Dirac and Majorana sectors of neutrino masses. We show that large mixing governing the dominant channel of the atmospheric neutrino oscillations can be naturally obtained and point out that this constrained seesaw mechanism favours the normal mass hierarchy for the light neutrinos leading to a small V-e3 entry of the lepton mixing matrix and a mass scale of the lightest right handed neutrino M similar or equal to 10(10)-10(11) GeV. Any of the three main neutrino oscillation solutions to the solar neutrino problem can be accommodated. The inverted mass hierarchy and quasi-degeneracy of neutrinos are disfavoured in our scheme. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:215 / 223
页数:9
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