Physics at Tristan

特里斯坦物理

• 批准号: 63540231
• 负责人: SHIMIZU Yoshimitsu
• 金额: $ 1.28万
• 依托单位: National Laboratory for High Energy Physics
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63540231/
• 关键词: Radiative correction; e^-e^+ annihilation; Electro-weak theory; Supersymmetry; B meson; QCD; Tristan; LEP; ヒッグス粒子; 複合模型; CP非保存; ジェット現象; 中性B粒子; トッポニウム

1. The calculation of radiative corrections in unified electro-weak theory has been accomplished, and the whole results have been published in the journal, Progr. Theor Phys.2. A computer program, which can automatically calculate the amplitudes and crosssections of all possible processes in unified electro-weak theory and QCD was made, and the successful results have been reported in international conferences.3. The review of the jet generation method based on QCD, which is one of the most important achievement in the present research project, is now under preparation. This will be the most important subject in the Tristan experiment from now on.4. A quantitative analysis of higher order QCD corrections to the e^-e^+ annihilation cross sections at Tristan and LEP have been done.5. The uncertainty in the evaluation of Kobayashi-Maskawa matrix element has been estimated, by analyzing semi-leptonic B decay processes in different models.6. The production cross section of bound states made of colored particles, like topponium, has been considered.7. A possibility that scalar top particle in super, symmetric theory is produced at Tristan energy region has been studied.8. Slightly larger than expected hadronic production rate at Tristan and Z decay width at LEP have been measured. The possibility that these are due to the radiative corrections of super particles was investigated.

1.完成了统一电弱理论中辐射修正的计算，全部结果已发表在Progr. Theor Phys.2.编制了一个能自动计算统一电弱理论和QCD中所有可能过程的振幅和截面的计算机程序，并在国际会议上报道了成功的结果.基于量子色动力学的喷流产生方法是本研究项目的重要成果之一，目前正在准备对该方法进行评述。这将是今后特里斯坦实验中最重要的课题。定量分析了高阶QCD对Tristan和LEP的e^-e^+湮灭截面的修正.通过分析不同模型下的半轻子B衰变过程，估计了Kobayashi-Maskawa矩阵元计算的不确定度.考虑了由色粒子（如托波偶素）构成的束缚态的产生截面.研究了超对称理论中标量顶粒子在特里斯坦能区产生的可能性.在特里斯坦和Z衰变宽度在LEP稍大于预期的强子产生率已被测量。研究了这是由于超粒子辐射修正引起的可能性。

项目成果

M.Drees: "Note on QCD corrections to hadronic Higgs decay" Physics Letters B. 240. 455-464 (1990)

M.Drees：“关于强子希格斯衰变的 QCD 修正的注释”《物理快报》B. 240. 455-464 (1990)

K.Hagiwara: "Limits on an additional Z boson from e^+e^- annihilation data" Physical Review D. 41. 815-823 (1990)

K.Hagiwara：“来自 e^ e^- 湮灭数据的附加 Z 玻色子的限制”物理评论 D. 41. 815-823 (1990)

藤本順平: Mod.Phys.Lett.3A. 581-588 (1988)

藤本顺平：Mod.Phys.Lett.3A。581-588 (1988)

H.Tanaka: "Numerical Calculation of Feynman amplitudes for electroweak theories and an application to e^+e^-→W^+W^-Υ" Computer Physics Communications. (1991)

H.Tanaka：“电弱理论的费曼振幅的数值计算及其在 e^+e^-→W^+W^-Y 中的应用”计算机物理通讯（1991）。

M.Drees: "Scalar top production in e^+e^- annihilation" Physics Letters B. 252. 127-134 (1990)

M.Drees：“e^ e^- 湮灭中的标量顶产生式”《物理快报》B. 252. 127-134 (1990)