Origin of CP and T Violation and Flabor Physiscs

CP 和 T 破坏的起源以及 Flabor 物理学

• 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

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一系列严肃的实验对抗之后建立起来的。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方法。为此，我们确定了以下两个研究课题：（1）阐明夸克质量产生的机制，（2）理解CP破坏的起源。(1)为了从量子场论的角度理解夸克质量产生的机制，我们用非微扰方法研究了在有限温度和强外引力作用下手征对称性的动力学破缺，阐明了夸克质量产生的动力学机制。 ...更多信息 在分析方法中产生质量。通过这一分析，我们得到了一个线索，可以用来研究宇宙早期夸克和轻子质量的产生过程，而在标准理论中，我们无法回答为什么顶夸克质量是电弱质量标度（100-200 GeV），而其他夸克和轻子的质量比顶夸克质量小得多。在本研究中，我们试图在左右对称模式的框架下回答这个问题。该模型适合于解释轻夸克和轻子质量的跷跷板机制是内置的。在发现了比目前研究的重得多的顶夸克后，我们发现跷跷板机制可以调整到不影响顶夸克，使顶夸克的质量保持在电弱质量标度的量级。因此，左右对称模型被认为是值得考虑的候选模型背后的标准理论。(2)CP破坏的起源我们研究了如何在左右对称模型中导出Kobayashi-Maskawa矩阵。与标准理论不同的是，该模型破坏了Kobayashi-Maskawa矩阵的酉性。因此，中性电流出现在采油树水平。中性电流的大小估计是足够小，使其远低于目前的实验界限。然而，在即将投产的B工厂进行的实验测试发现相当困难。今后的工作是把目前的分析推广到K介子系统和中微子物理。少

项目成果

Y. Kiyo: "Does Leading In x Ressumation Predict the Rise of g _1 at small x?"Zeitschrift fur Physik C. C74. 631-639 (1997)

Y. Kiyo：“引入 x 恢复是否会预测 g _1 在小 x 处的上升？”Zeitschrift Physik C. C74。

T. Morozumi: "B → Xg, 1 ^+ 1 ^- (g=d, s) and determination of | Vtd/Vts |"Physical Review D. 56. 7240-7246 (1997)

T. Morozumi：“B → Xg, 1 ^+ 1 ^- (g=d, s) 和 | Vtd/Vts | 的测定”物理评论 D. 56. 7240-7246 (1997)

M.R.Ahmady et al.: "Intermediate Pseudoscaln Resonance Contributions to B → Xs γ γ"Physical Review D. 57,3. 1997-2000 (1998)

M.R.Ahmady 等人：“中间伪斯卡恩共振对 B → Xs γ γ 的贡献”物理评论 D. 57,3 (1998)

K-I.Ishikawa et al.: "fs with Lattice NRQCD including 0(1/mィイD12ィエD1) corrections"Physics Review Letters. 56. 7028-7138 (1997)

K-I.Ishikawa 等人：“包含 0(1/m2D12D1) 校正的 Lattice NRQCD 的 fs”《物理评论快报》56. 7028-7138 (1997)。

T.Morozumi: "World Scientific"Determination of[Vtd/Vts] within the standard model. (1998)

T.Morozumi：“世界科学”标准模型内[Vtd/Vts]的测定。