Theoretical studies on SUSY-particle search at colliders

对撞机 SUSY 粒子搜索的理论研究

基本信息

批准号：
11440083
负责人：
SHIMIZU Yoshimitsu
金额：
$ 6.72万
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 Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

The computation of the cross section of the SUSY processes is very cumbersome already on the Born level due to the existence of a large number of particles, in particular of Majorana particles, and fermion number violating vertices. We, the Minami Tateya group, have completed the automatization of the computation of the Born cross section in MSSM. The result is crystallized as the program package GRACE/SUSY.Supplementing GRACE/SUSY with the routines for the computation of the one-loop amplitudes, we have constructed the package of the automatic computation of the MSSM processed including the one-loop radiative corrections as well as the initial and final state real photon radiation GRACE/SUSY/L. Concerning renormalization procedure we have used the following scheme : [1] The on-shell renormalization. [2] The dimensional reduction. [3] The gauge symmetric renormalization. [4] A linear gauge-fixing functions. The package has been checked in two methods. (1) The vanishing of ultraviolet divergence and the infrared divergence. (2) The comparison with the results obtained by hand-computing or with the result already published in journals. Since these two method are not sufficient to detect some potential errors in the package, we are installing the non-linear gauge fixing functions in this package, which in the case of the Standard Model, is proven to provide a powerful tool for the check of self-consistency of the package.For the practical application, we analyzed in detail five processes of Higgs production.

由于存在大量粒子，特别是马约拉纳粒子和费米子数破坏顶点，SUSY 过程的横截面计算在玻恩水平上已经非常麻烦。我们，Minami Tateya 小组，已经完成了 MSSM 中玻恩截面计算的自动化。结果被具体化为程序包GRACE/SUSY。在GRACE/SUSY中补充单环振幅计算例程，我们构建了MSSM自动计算包，包括单环辐射校正：以及初始和最终状态的真实光子辐射 GRACE/SUSY/L。关于重整化过程，我们使用了以下方案：[1]壳上重整化。 [2] 降维。 [3] 规范对称重正化。 [4] 具有线性标尺固定功能。包裹已通过两种方法进行检查。 (1)紫外发散角和红外发散角消失。 (2)与手工计算结果或已发表在期刊上的结果进行比较。由于这两种方法不足以检测包中的一些潜在错误，因此我们在该包中安装了非线性量规固定功能，在标准模型的情况下，这被证明可以为检查提供强大的工具。封装的自洽性。为了实际应用，我们详细分析了希格斯玻色子产生的五个过程。