Solar Neutrino Problem and Supersymmetric Grand Unified Theories

1.研究了如何从实验数据中重建NNI形式的夸克质量矩阵，并尝试在超对称大统一理论中同时解释夸克和轻子的质量和混合。特别地，我们考虑了一个具有两个10维Higgs和一个126个Higgs多重态的超对称SO(10)模型。在该模型中，左手中微子质量矩阵用夸克和带电轻子质量矩阵表示。仅用两个可调参数，我们就成功地解释了观测到的中微子质量和混合的模式。我们探索了复合中微子及其结果的可能性。我们从无中微子双β衰变的约束出发，分析了双β衰变约束下的e^-e^-*W^-W^-散射。对超对称模型中的味道破坏物理进行了研究。特别地，我们分析了bsll衰变和muegamma衰变。

1. We examined how to reconstruct quark mass matrices in the NNI form from the experimental data.We made an attempt to explain masses and mixing of quarks and lep-tons simultaneously in supersymmetric grand unified theories. In par-ticular, we consider a SUSY SO(10) model with two 10 dimensional Higgs and one 126 Higgs multiplets. In this model, the left-handed neutrino mass matrix is expressed in terms of quark and charged lepton mass matrices. With only two adjustable parameters, we successfully explain the observed pattern of neutrino masses and mixings.2. We explored the possibiltiy of composite neutrinos and their consquences. We derived the constraint from the neutrinoless double beta decay and also analyzed e^-e^- * W^-W^- scattering with the double beta decay constraint.3. We made research on the flavor violation physics in the supersymmetric models. In particular, we analyzed the b * sll decay and mu * egamma decays.