Study of Neutrino Oscillations and Neutrino Masses, Mixings

中微子振荡和中微子质量、混合的研究

• 批准号: 10640274
• 负责人: TANIMOTO Morimitsu
• 金额: $ 1.54万
• 依托单位: NIIGATA UNIVERSITY (2000-2001)Ehime University (1998-1999)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640274/
• 关键词: Neutrino Oscillations; Flavor Symmetry; Neutrino Mass Matrix; Neutrino Mixings; CP Violation; CP対称性; ニュートリノ質量; 大気ニュートリノ; 太陽ニュートリノ

Models of neutrino mass matrix have been studied phenomenologically by taking account of the recent data of neutrino oscillations during 1998-2001.1. The lepton mixing matrix has been determined by using recent data like the CKM matrix in the quark sector.2. The flavor symmetry U(1) has been investigated based on the LMA-MSW solution of the solar neutrino problem. It is found that the discrete symmetry like Z_2 is required in order to be consistent with the experimental data.3. The non-abelian flavor symmetries such as S_3 and Ο(3) have been investigated for the neutrino mass matrix.4. The relation between the lepton mixing matrix and the CKM matrix has been studied in the SU(5) GUT, where the renormalization group equations are nsed.5. Possible patterns of the neutrino and the charged, mass matrices phenomenologically. It is found that many patterns of the mass matrices are consistent with the experimental data for the present.6. The branching ratio of μ→ey is studied in the neutrino models. If neutrino masses are quai-degenerate, the branching ratio is suppressed, and then it is consistent with the experimental upper bound.

利用1998- 2001年中微子振荡的最新数据，对中微子质量矩阵模型进行了唯象研究。轻子混合矩阵是利用最近的数据如夸克扇区中的CKM矩阵确定的.基于太阳中微子问题的LMA-MSW解，研究了味对称性U（1）。发现为了与实验数据相一致，需要像Z_2那样的离散对称性.研究了中微子质量矩阵的S_3和O（3）等非阿贝尔味对称性.在SU（5）大统一理论中研究了轻子混合矩阵与CKM矩阵之间的关系，其中求解了重整化群方程。5.中微子和带电质量矩阵的可能模式。发现质量矩阵的许多模式与本实验数据相一致.在中微子模型中研究了μ→ey的分支比。如果中微子质量是准简并的，则分支比被抑制，并且与实验上界一致。

项目成果

M.Tanimoto: "Large Mixing Angle MSW Solution in S_3 Flavor Symmetry"Physics Letters. B483・3. 417-424 (2000)

M.Tanimoto：“S_3 风味对称性中的大混合角 MSW 解决方案”物理快报 B483·3（2000）。

M. Fukugita, M. Tanimoto: "Lepton Flavor Mixing Matrix and CP violation from Neutrio Osciltation Experiments"Physics letters. B515.1. 30-32 (2001)

M. Fukugita，M. Tanimoto：“中微子振荡实验中的轻子风味混合矩阵和 CP 破坏”物理快报。

M.Tanimoto: "Search for CP violation with a nentrino factory"Physics Letters B. 462(1号). 115-120 (1999)

M.Tanimoto：“利用 nentrino 工厂寻找 CP 破坏”《物理学快报》B. 462（第 1 期）（1999 年）。

A. Kageyama, S. Kaneko, N. Shimoyama, M. Tanimoto: "Lepton Flovor Violating Proass in Degenerate and Inverse hierorchical Neutrino Models"Physics letters. B527.2. 206-214 (2002)

A. Kageyama、S. Kaneko、N. Shimoyama、M. Tanimoto：“简并和逆分层中微子模型中的轻子流破坏过程”物理快报。

T.Watari,M.Tanimoto,T.Yanagida: "Democratic Mass Matrices-from Broken O(3)_L×O(3)_R Flaron Spmetry"Physics Letters B. 461(3号). 345-351 (1999)

T.Watari、M.Tanimoto、T.Yanagida：“民主质量矩阵 - 来自破碎的 O(3)_L×O(3)_R Flaron Spmetry”《物理快报》B. 461(3) (1999)。