Radiative Corrections to Boson Pair-Production in Electron-Positron Collisions

正负电子碰撞中玻色子对产生的辐射校正

• 批准号: 10640282
• 负责人: KATO Kiyoshi
• 金额: $ 1.28万
• 依托单位: Kogakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640282/
• 关键词: High Energy Physics; Standard Model in Particle Physics; Automation in Perturbation; Radiative Correction; Electron-Positron Collision; New Particle Search; Non-Linear Gauge

The main goal of this research project is to calculate the radiative corrections to the four-fermion production in electron-positron collisions based on the standard model and, if possible, on the supersymmetric models. The calculation is essential for the precise understanding of W-physics in the LEP-II experiments.In this project, we have achieved the followings.We computed the one-loop radiative correction to W and two fermions production. Though the process is simpler than the target process, this work has two off-springs : First, it can check the function of automated systems. Second but more important point is that it enables us to estimate the discrepancy from the computation based on the factorization. We found 1-2% deviation from the factorized results, so that the full one-loop calculation is necessary for the full understanding of the W pair production.Also, in this project, we have introduced the automated system a new mechanism to check the large-scale computation. The use of generalized non-linear gauge is used as a useful diagnostics. The validity of this check is demonstrated through the explicit computation for various two-to-two processes.Unfortunately, the final item, the development of a practical event generator, is not yet finished within the term of the project. It is expected that it will be end within a year.

本研究项目的主要目标是基于标准模型，如果可能的话，基于超对称模型，计算电子-正电子碰撞中四费米子产生的辐射修正。在LEP-II实验中，计算对于精确理解W-物理是必不可少的，在本项目中，我们取得了以下成果：计算了W的单圈辐射修正和两个费米子的产生。虽然该过程比目标过程简单，但这项工作有两个分支：第一，它可以检查自动化系统的功能。第二，但更重要的一点是，它使我们能够估计的差异，从计算的基础上因式分解。我们发现与因式分解的结果有1-2%的偏差，因此为了充分理解W对的产生，需要进行完整的单循环计算。此外，在本项目中，我们引入了自动化系统，这是一种新的机制来检查大规模计算。广义非线性规范的使用被用作有用的诊断。通过对各种二对二过程的显式计算证明了这种检查的有效性。不幸的是，最后一个项目，一个实际事件发生器的开发，尚未在项目期限内完成。预计将在一年内结束。

项目成果

K. Kato et al.: "Implementation of the Non-Linear Gauge into GRACE"Proceedings of AIHEN 99. 印刷中 (2000)

K. Kato 等人：“将非线性测量仪实施到 GRACE”AIHEN 99 号论文集。出版中 (2000)

F. Yuasa et al.: "Automatic Computation of Cross Sections in HEP"Progress of Theoretical Physics Supplement. vol.138. 18-23 (2000)

F. Yuasa 等人：“HEP 中横截面的自动计算”理论物理进展增刊。

F. Yuasa et al.: "Automatic Computation of Cross Sections in HEP"Supplement of Progress of Theoretical Physics. 印刷中 (2000)

F. Yuasa 等人：“HEP 中横截面的自动计算”理论物理学进展补充刊（2000 年）。

F.Yuasa et al.: "Automatic Computation of Cross Sections in HEP"Progress of Theoretical Physics Supplement. 138. 18-23 (2000)

F.Yuasa 等人：“HEP 中横截面的自动计算”理论物理进展增刊。

P. Aurenche et al.: "The QCD and Standard Model Working Group : Summary Report"Les Houches 1999. hep-ph/0005114. 1-179 (2000)

P. Aurenche 等人：“QCD 和标准模型工作组：总结报告”Les Houches 1999。hep-ph/0005114。