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New Physics Search via Radiative Corrections

通过辐射校正进行新的物理搜索

基本信息

批准号：
06640401
负责人：
HIOKI Zenro
金额：
$ 0.64万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06640401/
关键词：
Radiative Corrections Electroweak Quantum Effects New Physics Heavy Quark Effective Theory Nonleptonic Decays Top Quark Pair Productions CP violation 電弱相互作用精密検証統一理論

项目摘要

It is well-known that various weak-interaction processes are successfully described by the standard electroweak theory, which is based on SU (2) * U (1) gauge group, and we have so far no reliable data which require any corrections or extention of this theory. From theoretical point of view, however, it is often pointed out that this theory will not be the "final theory". Radiative corrections are an important and effective window on new physics beyond this standard theory. This is because even very heavy particles which cannot be produced in actual experiments can affect physical observables as the quantum effects. On the other hand, we expect direct productions of new particles/phenomena at future accelerators like NLC/LHC.In this research, we aimed to investigate not only radiative corrections as pure loop effects but also nonstandard interactions which may be induced via radiative corrections, studying from relatively-low-energy B/D-hadron decays to high-energy top-quark pair productions at NLC.A remarkable result is an analysis of the structure of the electroweak radiative corrections. There, we found that the latest data of W/Z masses strongly indicate the existence of the nondecoupling effects via the heavy top loops. This will be a strong constraint on various models of new physics beyond the standard theory.

众所周知，以SU（2）U（1）规范群为基础的标准电弱理论成功地描述了各种弱相互作用过程，迄今为止，我们还没有可靠的数据需要对该理论进行任何修正或扩展。然而，从理论的角度来看，经常有人指出，这一理论不会是“最终的理论”。辐射修正是研究标准理论之外的新物理学的一个重要而有效的窗口。这是因为即使是在实际实验中无法产生的非常重的粒子也可以像量子效应一样影响物理观测。另一方面，我们期望在未来的加速器上直接产生新的粒子/现象，如NLC/LHC。在这项研究中，我们的目标不仅是研究作为纯环效应的辐射修正，而且还研究可能通过辐射修正引起的非标准相互作用，从相对低能的B/D强子衰变到高能的顶强子的研究，一个值得注意的结果是分析了电弱辐射修正的结构。在那里，我们发现，最新的数据的W/Z质量强烈表明存在的非去耦效应通过重顶环。这将是对标准理论之外的各种新物理模型的一个强有力的约束。