Theoretical studies on SUSY-particle search at colliders

对撞机 SUSY 粒子搜索的理论研究

• 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
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440083/
• 关键词: Supersymmetry; Higher order correction; Linear collier physics; Higgs particle; SUSY particle; Feynman diagrams; Automatic system; GRACE; 自動計算; SUSY; 輻射補正; ヒッグス粒子; ゲージ不変性; ファインマン図; 振動論; LEP-II実験; W・ボソン; ファインマン振幅; GRACEシステム; 非線形ゲージ固定項

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.

超对称过程的横截面的计算是非常繁琐的玻恩水平上已经由于存在大量的粒子，特别是马约拉纳粒子，和费米子数违反顶点。我们，南立谷小组，已经完成了在MSSM玻恩截面计算的自动化。在GRACE/SUSY的基础上增加了计算单圈振幅的程序，构造了包括单圈辐射修正和初、终态真实的光子辐射的MSSM自动计算程序GRACE/SUSY/L。关于重整化过程，我们使用了以下方案：[1]在壳重整化。[2]降维。[3]规范对称重整化。[4]线性定尺功能。该包已通过两种方法检查。(1)紫外发散和红外发散的消失。(2)与手工计算所得结果或已发表在期刊上的结果进行比较。由于这两种方法都不足以检测到包中的一些潜在错误，我们在包中加入了非线性规范固定函数，在标准模型的情况下，这被证明是一个强有力的工具，用于检查包的自洽性。

项目成果

G. Belanger, F. Boudjema, T. Kon, V. Lafage: "Z radiation off stops at a linear collider"Eur. Phys. J.. C12. 323-330 (2000)

G. Belanger、F. Boudjema、T. Kon、V. Lafage：“Z 辐射停止于线性对撞机”Eur。

Y.Kurihara: "QED radiative correction for the single-W production using a parton shower method"The European Physical Journal. C20. 253-258 (2001)

Y.Kurihara：“使用帕顿簇射法对单 W 生产进行 QED 辐射校正”《欧洲物理杂志》。

J. Fujimoto, T. Ishikawa, T. Kaneko, K. Kato, M. Kuroda, V. Lafage, Y. Shimizu: "Automatic calculation of one-loop radiative corrections to SUSY processes with GRACE system"Proceedings of AIHEP 99 Workshop.

J. Fujimoto、T. Ishikawa、T. Kaneko、K. Kato、M. Kuroda、V. Lafage、Y. Shimizu：“使用 GRACE 系统自动计算 SUSY 过程的单环辐射修正”AIHEP 99 研讨会论文集。

湯浅富久子: "高エネルギー加速器研究機構自動計算システム開発グループ"応用数理. 10・4. 84-87 (2000)

汤浅富子：“高能加速器研究机构自动计算系统开发小组”应用数学10・4（2000）。

Y.Kurihara et al.: "QED radiative correction for the single-W production using a parton shower method"Eur.Phys.J.. C20. 253-258 (2001)

Y.Kurihara 等人：“使用帕顿喷淋法对单 W 生产进行 QED 辐射校正”Eur.Phys.J.. C20。