Grand Unified Theory and Neutrino Mass

大统一理论和中微子质量

• 批准号: 63540202
• 负责人: YANAGIDA Tsutomu
• 金额: $ 1.28万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540202/
• 关键词: Solar neutrino; Neutrino mass; Neutrino oscillation; 17 keV neutrino; Ground unified theory; Cosmological baryon number; Kamioka experiment; Homestake experiment; ニュ-トリノの崩壊; 宇宙背景輻射; ニュ-トリノの振動; 大気ニュ-トリノ; スファレロン解; 宇宙のバリトン数; ニュートリノの質量; リュートリノ振

(1) We analyzed the result of recent solar neutrino experiments from the Homestake, Kamioka and Boksan Laboratories. We found that the results from Homestake and Kamioka, if the two data sets are combined, strongly suggest some unusual neutrino properties rather than the modification of astrophysical models of the sun. The neutrino oscillation in matter proposed by Mikheyev and Smirnov among several possibilities yields the most attractive explanation for the neutrino flux defict. The solution suggests that mv_x <similar or equal> 10^<-3>-10^<-4> eV which is in the region predicted by the simple SO(10) grand unified model. We stressed also it is tested by the gallium experiment.(2) In 1985 Simpson reported the evidence for a heavy neutrino with a mass of 17 keV in the beta decay of tritium. Recently, the consistent evidence for this particle has been reported in ^<14>C beta decay spectrum. We first showed that this 17 keV neutrino must be a Dirac fermion. Secondly, We found a natural model which includes one Dirac neutrino and others are Majorana fermions with very small masses. We also showed that there are a class of model in which the 17 kev neutrino is compatible with the MSW-Solution to the solar neutrino problem.

(1)我们分析了Homestake、Kamioka和Boksan实验室最近的太阳中微子实验结果。我们发现Homestake和Kamioka的结果，如果把这两个数据集结合起来，强烈地暗示了一些不寻常的中微子特性，而不是对太阳天体物理模型的修改。米赫耶夫和斯米尔诺夫在几种可能性中提出的物质中的中微子振荡，为中微子通量赤字提供了最吸引人的解释。解表明mv_x <相似或等于>0 ^<-3>-10^<-4> eV，处于简单SO（10）大统一模型预测的区域。并强调用镓实验对其进行了验证。1985年，辛普森报告了在氚的β衰变中存在质量为17kev的重中微子的证据。最近，在^<14>C β衰变谱中报道了该粒子存在的一致证据。我们首先证明了这个17kev的中微子一定是狄拉克费米子。其次，我们发现了一个自然模型，其中包括一个狄拉克中微子和其他质量非常小的马约拉纳费米子。我们还证明了存在一类模型，其中17kev中微子与太阳中微子问题的msw解兼容。

项目成果

福来,正孝: "Simple Particle-Physics Model for the Reheating of the Vniverse" Physical Review Letters. 63. 585-588 (1989)

Fukugita Masataka：“Vniverse 重新加热的简单粒子物理模型”物理评论快报 63. 585-588 (1989)。

福来 正孝: "SphaleronーInduced BaryonーNumber Nonconservotion and a Constraint on Majorana Neutrino Mass" Physical Review D. 42. 1285-1286 (1990)

Masataka Fukugita：“Sphaleron-Induced Baryon-Number Nonconservation and a Constraint on Majorana Neutrino Mass”Physical Review D. 42. 1285-1286 (1990)

福来 正孝: "Possible Solution to the Discrepancy between the Homestake and Kamiokande SolarーNeutrino Experiments" Physical Review Letters. 65. 1975-1978 (1990)

Masataka Fukugita：“Homestake 和 Kamiokande 太阳中微子实验之间差异的可能解决方案”物理评论快报 65。1975-1978 (1990)。

福来 正孝: "Implication of the Recent Solar Neutrino Experiment for Particle Physics" Modern Physics Letters A. (1991)

福吉田正孝：“最近太阳中微子实验对粒子物理学的影响”现代物理学快报 A. (1991)

T.Hatsuda: Modern Physics Letters A. 12. 1133-1136 (1988)

T.Hatsuda：现代物理学快报 A.12.1133-1136 (1988)