Higgs Particle Hunting and Attempts going beyond the Standard Model

希格斯粒子搜寻和超越标准模型的尝试

• 批准号: 09640353
• 负责人: KUBOTA Takahiro
• 金额: $ 1.6万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640353/
• 关键词: Higgs boson; radiative correction; screening theorem; Seiberg-Witten theory; conformal invariance; black hole; D-brane; 暗黒物質; ニュートラリート; MSSM; AdS; CFT; Fokker-Planck方程式; D-brane; Hanany-Witten効果; Cardy境界状態; CFT対応; 超弦理論; 共形場理論; ビラソロ代数

The decay rates of Higgs boson into gauge boson pairs were evaluated in the two-Higgs doublet model including radiative corrections. We have found that the effects of heavy unknown particles through radiative corrections are always subleading. This is a generalization of the screening thorem. One-loop corections to the elastic scattering of gauge bosons have also been evaluated in the two-Higgs doublet model.The decay processes of the bottom quark such as b→sl^+l^-, b→svv^^- have been calculated in the minimal supergravity model and multi-Higgs doublet model. It was found in the supergravity model that the branching ratio of the decay b→sl^+l^- could be much larger than in the standard model.To get signals of lepton-flavor violation in accelerator experiments, we have investigated the processes μ^+μ^- (e^+e^-)→τμ+4jets+missing-energy, and μ^+μ^- (e^+e^-)→τμl+2jets+missing energyTo probe the theory beyond the standard model, we have ventured to study various aspects of quantum field theories and superstring. More concretely, we have investigated superconformal invariance realized in particular points in the moduli space of the Seiberg-Witten theory. We have also worked out the derivation of the asymptotic conformal invariance of the three-dimensional anti-de Sitter gravity based on the Chern-Simons theory, and the black hole entropy in the conformal field theory approach. As to the study of superstring, our research includes the investigation of the N=2 QCD from the viewpoints of M-theory, second quantization of the D5-brane, and the Hanany-Witten effects and its relation to the determination of the charge of D2-brane.

在考虑辐射修正的双Higgs玻色子模型中计算了Higgs玻色子衰变为规范玻色子对的速率。我们发现，通过辐射修正，未知重粒子的影响总是次要的。这是筛选定理的推广。在双Higgs模型中计算了规范玻色子弹性散射的单圈修正，在最小超引力模型和多Higgs模型中计算了底夸克的衰变过程B→sl^+l^-，B→svv^^-。在超引力模型中发现衰变B→sl^+l^-的分支比可能比标准模型大得多.为了在加速器实验中得到轻子味破坏的信号，我们研究了μ^+μ^-（e^+e^-）→τμ +4喷流+丢失能量和μ^+μ^-（e^+e^-）→τμl+2喷流+丢失能量两个过程.我们已经大胆地研究了量子场论和超弦的各个方面。更具体地说，我们研究了在塞伯格-威滕理论的模空间中的特定点上实现的超共形不变性。利用Chern-Simons理论推导了三维反de Sitter引力的渐近共形不变性，并利用共形场论方法推导了黑洞熵。在超弦的研究方面，我们的研究包括从M理论的角度研究N=2的QCD，D5-膜的二次量子化，Hanany-Witten效应及其与D2-膜电荷确定的关系。

项目成果

T.Nakatsu: "Toward Second Quantization fo D5-Brane"Journal of Modern Physics A. 13. 923-964 (1998)

T.Nakatsu：“走向 D5-膜的第二量子化”现代物理学杂志 A. 13. 923-964 (1998)

T.Nakatus et al.: "A Proof of Brane Creation via M-Theory"Modern Physics Letters A. 13. 293-302 (1998)

T.Nakatus 等人：“A Proof of Brane Creation via M-Theory”Modern Chemistry Letters A. 13. 293-302 (1998)

K.Furuuchi, H.Kunitomo and T.Nakatsu: "Topological field theory and second-quantized five-branes"Nuclear Physics. B 494. 144-160 (1997)

K.Furuuchi、H.Kunitomo 和 T.Nakatsu：“拓扑场论和第二量子化五膜”核物理。

T.Nakatsu, K.Ohta, T.Yokono and Y.Yoshida: "A Proof of Brane Creation via M Theory"Mod.Phys.Lett.. A13. 293-302 (1998)

T.Nakatsu、K.Ohta、T.Yokono 和 Y.Yoshida：“通过 M 理论证明膜的创造”Mod.Phys.Lett.. A13。

T.Kubota,.J.-Ge Zhou: "RR charges of D2-branes in group manifold and Hanany-Witten effect"Journal of High Energy Physics. 12. 03000-03010 (2000)

T.Kubota,.J.-周戈：“群流形中 D2-膜的 RR 电荷和 Hanany-Witten 效应”高能物理杂志。