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Dynamical Electroweak Symmetry Breaking

动态电弱对称性破缺

基本信息

批准号：
05640339
负责人：
YAMAWAKI Koichi
金额：
$ 1.28万
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：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

One of the biggest problem of the modern particle theory is to understand the nature of the Higgs boson which is expected to be reponsible for the origin of mass of everything. The purpose of this research was to give a dynamical explanation of the Higgs boson as a composite particle.We studied various aspects of composite Higgs models, mainly the top quark condensate, from two sides :1) High energy approach based on the underlying microscopic theory,2) Low energy approach based on the macroscopic effective field theory written in terms of the composite fields.In the former approach, we gave a final proof of the "renormalizability of the gauged Nambu-Jona-Lasinio model" which was suggested by our previous works. This fact was further used to modify the top quark condensate so as to bring the top mass prediciton somewhat lower than the original prediciton in accord with the experiment. Also we found new phase structure and nontriviality of the gauged strongly-coupled Yukawa model.As to the latter approach, we proved lowenergy theorem of the hidden local symmetry at any loop order as an extension of our previous work to initiate the effective field theory formulation at one loop of the nonlinear sigma model having a hidden local symmetry.Also we found a peculiar behavior of the zero mode of the Nambu-Goldstone boson in the light-front quantization which recently attracted much interest in the context of nonperturbative solution of the field theories.

现代粒子理论最大的问题之一是理解希格斯玻色子的本质，希格斯玻色子被认为是万物质量起源的原因。本研究的目的是对Higgs玻色子作为复合粒子进行动力学解释。我们从两个方面研究了复合Higgs模型，主要是顶夸克凝聚体：1)基于微观理论的高能方法，2)基于复合场的宏观有效场理论的低能方法。在前者方法中，我们最终证明了我们以前的工作所提出的“规范的Nambu-Jona-Lasinio模型的可重整化”。这一事实被进一步用来修正顶夸克凝聚体，使顶质量预测值比原来的预测值略低，与实验相符。我们还发现了规范强耦合汤川模型的新的相结构和非平凡性质。对于后一种方法，我们证明了任意环阶隐藏局域对称性的低能定理，作为我们先前工作的扩展，在具有隐藏局域对称性的非线性sigma模型的一圈处启动有效场论公式。此外，我们还发现了Nambu-Goldstone玻色子零模在光前量子化中的特殊行为，这在场论的非微扰解的背景下最近引起了极大的兴趣。