Le+Lμ-Lτ-Ls symmetry and a mixed 2+2 scenario for neutrino oscillations

被引:16
作者
Babu, KS [1 ]
Mohapatra, RN
机构
[1] Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA
[2] Univ Maryland, Dept Phys, College Pk, MD 20742 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/S0370-2693(01)01315-6
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent results from SuperKamiokande and SNO experiments have set severe constraints on possible mixings of a light sterile neutrino, v(s) with the three active species required for a simultaneous explanation of the solar. atmospheric and LSND neutrino oscillation data. A consistent scheme has emerged from a global analysis of the data wherein two of the neutrinos are nearly degenerate with a mass of order 1 eV, that mix significantly with the two lighter states. We present realizations of such a mixed 2 + 2 oscillation scenario based on L-e + L-mu - L-tau - L-s symmetry (L-i stands for the ith lepton number). Breaking of of this lepton number symmetry by a small mass term for nu (s) leads to the required large mixings for both the atmospheric and the solar neutrino oscillations. Sum rules for the neutrino oscillation parameters are derived within this scheme, and are shown to be consistent with present data. These models predict U-e3 similar or equal to 0.02-0.03, which can serve as a test of this idea. We also present gauge models based on mirror extensions of the Standard Model that naturally lead to a light sterile neutrino with the required mixing pattern. (C) 2001 Published by Elsevier Science B.V.
引用
收藏
页码:287 / 296
页数:10
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