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Automatic Computation of Higher Order Corrections

高阶修正的自动计算

基本信息

批准号：
09044359
负责人：
SHIMIZU Yoshimitsu
金额：
--
依托单位：
High Energy Accelerator Research Organization
依托单位国家：
日本
项目类别：
Grant-in-Aid for International Scientific Research.
财政年份：
1997
资助国家：
日本
起止时间：
1997 至无数据
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09044359/
关键词：
standard theory Automatic calculation electron-positron collision W-boson higer order corrections in 1-loop level supersymmetric thoey event generator non-linear gauge 摂動輪の自動計算

项目摘要

According to the modern particle physics the leptons and quarks are considered to be the most fundamental elements of the matter. Various reactions of these particles are caused by the interaction with photons, heavy bosons and gluons. Their dynamics is described by the standard theory. In order to examine the theoretical predictions with experiments, the probability of the observed reactions should be calculated among all. Because of the complexity of the perturbative calculations, manipulations by hand become harder and harder. High precision predictions further require the higher order corrections, including 1-loop. This fact has led us to develop an automatic system. In this project the radiative corrections to the process e^+e^-*Wmuv^^- was estimated with the help of the system, for the first time in the world. The result differs sizeably from an approximated calculation known so far. Extension of the system is now undergoing in aiming at the radiative corrections to the final four fermion processes.The standard theory is apparently not the ultimate theory. A supersymmetric theory might by beyound that standard model. Many efforts have been made to discover the supersymmetric particles experimentally. Because of a number of particles and interactions, an automatic system for this theory is ineviatble ; it has been developed and some event generators created by the system have been supplied to the experimental analyzes.For an automatic system a self-check mechanism should be equiped for getting reliable results. Under the collaboration with French physicists, the non-linear gauge fixing terms were introduced into the system for this purpose.

根据现代粒子物理学，轻子和夸克被认为是物质的最基本元素。这些粒子与光子、重玻色子和胶子的相互作用引起了各种反应。它们的动力学由标准理论描述。为了用实验检验理论预测，应该计算所有观察到的反应的概率。由于微扰计算的复杂性，手工操作变得越来越困难。高精度预测还需要更高阶的校正，包括单循环。这一事实促使我们开发了一种自动化系统。在这个项目中，在世界上首次利用该系统估算了过程e^+e^-*Wmuv^^-的辐射修正。结果与迄今已知的近似计算结果有很大不同。该体系目前正在进行扩展，目标是对最后四个费米子过程进行辐射修正，标准理论显然不是终极理论。一个超对称理论可能会超越标准模型。为了在实验上发现超对称粒子，人们做了许多努力。由于该理论涉及大量的粒子和相互作用，因此不可避免地需要一个自动化系统，目前已经研制成功了该系统，并提供了一些用于实验分析的事件发生器。对于自动化系统，应配备自检机制，以获得可靠的结果。在与法国物理学家的合作下，为此目的，将非线性规范固定项引入系统。