Origin of CP and T Violation and Flabor Physiscs

CP 和 T 破坏的起源以及 Flabor 物理学

基本信息

批准号：
08044089
负责人：
MUTA Taizo
金额：
$ 4.8万
依托单位：
HIROSSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for international Scientific Research
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08044089/
关键词：
Quark Lepton Origin of mass CP violation B meson Dynamical symmetry breaking クオーク質量フレーバー混合シ-ソ-機構 CPの破れトップクオーク FCNC 小林、益川角

项目摘要

The standard theory of elementary particles seems to have been established after a number of serious experimental confrontations. It is, however, not within the reach of the standard theory to explain the mechanism of generating the quark and lepton masses and the origin of the CP violation. The purpose of our research project is to explore models of elementary particles lying behind the standard theory and to propose experimental means to test these models. For this purpose we settled the following two research subjects: (1) Clarifying the mechanism of the generation of quark masses, (2) understanding the origin of the CP violation.(1) Mechanism of the generation of quark massesIn order to understand the mechanism of the mass generation on the basis of quantum field theory we have studied the dynamical breaking of the chiral symmetry at finite temperature as well as under the strong external gravity by the use of nonperturbative methods, and have clarified the dynamical mechanism of g … More enerating masses in the analytical approach. With this analysis we got an insight into a clue to investigate the process how the quark and lepton masses are generated in the early stage of the Universe.In the standard theory we are not able to find an answer to the question why the top quark mass is of the order of the electro weak mass scale (100-200 GeV) and the masses of the other quarks and leptons are much smaller than the top quark mass. In the present research we attempted to answer the Question in the framework of the left-right symmetric mode. The model is suited to explain the light quark and lepton masses as the see-saw mechanism is built in. After the discovery of the top quark which is much heavier than the present study it is found that the see-saw mechanism may be adjusted to make no influence to the top quark keeping the top quark mass of the order of the electro weak mass scale. Accordingly the left-right symmetric model is found to be worth consideration for a candidate of the model behind the standard theory.(2) Origin of the CP violationWe examined how the Kobayashi-Maskawa matrix is derived in the left-right symmetric model. Unlike to the standard theory the model exhibits the violation of the unitarily of the Kobayashi-Maskawa matrix. As a result the neutral current shows up at the tree level. The size of the neutral current is estimated to be sufficiently small so that it is well below the present experimental bound. However experimental tests in the B factory which will be soon operating are found to be quite hard. It will be our future task to extend the present analysis to that of the K meson system and the neutrino physics. Less

基本粒子的标准理论似乎是在经过一系列严重的实验冲突后才建立起来的，然而，标准理论无法解释夸克和轻子质量的产生机制以及CP破坏的起源。我们的研究项目的目的是探索标准理论背后的基本粒子模型，并提出测试这些模型的实验手段，为此我们确定了以下两个研究课题：（1）阐明夸克的产生机制。群众，（2）了解起源(1)夸克质量的产生机制为了在量子场论的基础上理解质量产生的机制，我们研究了有限温度下以及强外力作用下手性对称性的动态破缺。通过使用非微扰方法，我们阐明了 g 激发质量的动力学机制。通过这种分析，我们深入了解了研究夸克和轻子质量如何产生的过程。宇宙的早期阶段。在标准理论中，我们无法找到以下问题的答案：为什么顶夸克质量是电弱质量尺度（100-200 GeV）和其他夸克质量的数量级在本研究中，我们试图在左右对称模式的框架内回答这个问题，该模型适合将轻夸克和轻子质量解释为跷跷板机制。已建成在发现比目前研究重得多的顶夸克后，发现可以调整跷跷板机制，使其对顶夸克不产生影响，保持顶夸克质量为电弱质量量级因此，左右对称模型被认为是值得考虑的标准理论背后的模型候选者。（2）CP违规的起源我们研究了小林-增川矩阵是如何在左右中导出的。对称模型。与标准不同根据理论，该模型违反了小林-益川矩阵的酉性，因此中性电流出现在树级别，估计中性电流的大小足够小，因此远低于当前的实验结果。然而，即将投入运行的 B 工厂的实验测试发现，将当前的分析扩展到 K 介子系统和中微子物理是相当困难的。