Superstring Theory and Low-Energy Physics

超弦理论与低能物理

• 批准号: 02640223
• 负责人: MATSUOKA Takeo
• 金额: $ 0.77万
• 依托单位: Nagoya 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: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640223/
• 关键词: Superstring Theory; Conformal Invariance; Compactification; Supersymmetry; Yukawa Coupling; R-Parity Violation; Gauge Hierarchy; Generation Mixing; カラビ-ヤウのコンパクト化

Superstring theory is the most promising unified theory. In this theory the space-time dimension should be more than four so that the theory becomes consistent at quantum level. Four-dimensional effective theory is derived after the compactification through which the extra-dimensional space becomes a conformal invariant comactified manifold dynamically. In this theory topological and geometrical structure of the manifold is closely related to various properties of the low-energy effective theory such as gauge symmetries, matter fields and their couplings. Therefore, it is of critical importance to clarify the relation between the structure of compactified manifold and low-energy effective theory. In this proposed spontaneous deformation of conformal invariant manifold and using this mechanism we investigated viable effective theory from calabi-Yau superstring. We studied characteristic features of the effective theory and expected new phennomena at the electroweak scale.1. We found realistic solutions in which the proton stability is guaranteed and the unification of gauge couplings is realized.2. We pointed out the possibility that R-parity is spontaneously broken at TeV scale. Chargino and neutralino mass spectra are calculated and the lightest masses among them are predicted to be less than weak boson masses. Furthemore, we discussed the generation number and the structure of flavor mixing.3. In the two-Higgs-doublet model expected from the supersymmetric model, it is found that the charged Higgs contribution can give a sizable enhancement to the branching fractions of B-meson charamless decay.4. We studied the stability of quantum chiral solitions coupled with the vector mesons.

超弦理论是最有前途的统一理论。在这个理论中，时空维度应该大于4，这样理论在量子水平上才是一致的。紧化后的四维有效理论，通过动态共形不变的紧化流形的额外的维空间。在这个理论中，流形的拓扑和几何结构与低能有效理论的各种性质密切相关，如规范对称性，物质场及其耦合。因此，弄清楚紧致流形的结构与低能有效理论之间的关系是至关重要的。本文提出了共形不变流形的自发变形机制，并利用这一机制研究了卡-丘超弦的有效理论。我们研究了有效理论的特征，并期望在电弱尺度下出现新的现象.我们找到了现实的解决方案，其中质子的稳定性得到保证，规范耦合的统一得以实现.指出了R宇称在TeV量级自发破缺的可能性。计算了电荷伴子和中性伴子的质量谱，并预言它们中最轻的质量小于弱玻色子质量。进一步讨论了香味混合的代数和结构.在超对称模型所期望的双希格斯双重态模型中，发现带电希格斯粒子的贡献可以大大增强B-介子无Charamless衰变的分支分数。4.研究了与矢量介子耦合的量子手征孤立子的稳定性。

项目成果

A.J.Davies et al.: "Penguin Effects Induced by the TwoーHiggsーDoublet Model and Charmless BーMeson Decays." Z.Phys.C. 52. 97-103 (1991)

A.J.Davies 等人：“双希格斯双峰模型和无魅力 B 介子衰变引起的企鹅效应”Z.Phys.C. 52. 97-103 (1991)

C.Hattori: "Chargino and Neutralino Spectra in a SuperstringーInspired E_6 Model"

C.Hattori：“超弦中的Chargino和中性子光谱——灵感E_6模型”

A.J.DAVIES et al: "Exact Calculation of the Scalar-Induced gluonic Penguin Diagram in the Two-Higgs-Doublet Model." Rhys.Rev.D. 44. 2114-2117 (1991)

A.J.DAVIES 等人：“双希格斯双峰模型中标量诱导的胶子企鹅图的精确计算”。

Chuichiro HATTORI et al: "Neutrino Masses and Generation Number in the Superstring Inspired E_6 Model with Spontaneous R-Parity Violation." Phys.Rev.

Chuichiro HATTORI 等人：“超弦启发的 E_6 模型中的中微子质量和生成数，具有自发 R 宇称破坏。”

A. J. Davies et al: "Exact Calculation of the Scalar-Induced Gluonic Penguin Diagram in the two-Higgs-Doublet Model." Phys. Rev. D 44. 2114-2117 (1991)

A. J. Davies 等人：“双希格斯双峰模型中标量诱导的胶子企鹅图的精确计算”。