Neutrino textures in light of Super-Kamiokande data and a realistic string model

被引:87
作者
Ellis, J [1 ]
Leontaris, GK
Lola, S
Nanopoulos, DV
机构
[1] CERN, Div Theory, CH-1211 Geneva 23, Switzerland
[2] Univ Ioannina, Div Theoret Phys, GR-45110 Ioannina, Greece
[3] Texas A&M Univ, Dept Phys, Ctr Theoret Phys, College Stn, TX 77843 USA
[4] Houston Adv Res Ctr, Astroparticle Phys Grp, The Woodlands, TX 77381 USA
[5] Univ Athens, Chair Theoret Phys, Div Nat Sci, GR-10679 Athens, Greece
来源
EUROPEAN PHYSICAL JOURNAL C | 1999年 / 9卷 / 03期
关键词
D O I
10.1007/s100520050032
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
Motivated by the Super-Kamiokande atmospheric neutrino data, we discuss possible textures for Majorana and Dirac neutrino masses within the see-saw framework. There are two main purposes of this paper: first, to gain intuition into this area from a purely phenomenological analysis, and second, to explore to what extent it may be realized in a specific model. We comment initially on the simplified two-generation case, emphasizing that large mixing is not incompatible with a large hierarchy of mass eigenvalues. We also emphasize that renormalization-group effects may amplify neutrino mixing, and we present semi-analytic expressions for estimating this amplification. Several examples are then given of three-family neutrino mass textures, which may also accommodate the persistent solar neutrino deficit, with different assumptions for the neutrino Dirac mass matrices. We comment on a few features of neutrino mass textures arising in models with a U(1) flavour symmetry. Finally, we discuss the possible pattern of neutrino masses in a "realistic" flipped SU(5) model derived from string theory, illustrating how a desirable pattern of mixing may emerge. Both small- or large-angle MSW solutions are possible, while a hierarchy of neutrino masses appears more natural than near-degeneracy. This model contains some unanticipated features that may be relevant in other models also: The neutrino Dirac matrices may not be related closely to the quark mass matrices, and the heavy Majorana states may include extra gauge-singlet fields.
引用
收藏
页码:389 / 408
页数:20
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