2005 Fiscal Year Final Research Report Summary
Study of Mass Origin and Supersymmetry Physics
| Project/Area Number |
13047101
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| Research Category |
Grant-in-Aid for Scientific Research on Priority Areas
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | University of Tsukuba |
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Principal Investigator |
KIM Shinhong University of Tsukuba, Graduate School of Pure and Applied Sciences, Professor, 大学院数理物質科学研究科, 教授 (50161609)
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| Co-Investigator(Kenkyū-buntansha) |
AIHARA Hiroaki University of Tokyo, Graduate School of Science, Professor, 大学院理学系研究科, 教授 (60167773)
OHSHIMA Takayoshi Nagoya Univesity, Graduate School of Science, Professor, 大学院理学研究科, 教授 (00134651)
HIKASA Kenichi Tohoku Univesity, Graduate School of Science, Professor, 大学院理学研究科, 教授 (20208739)
SUGIMOTO Shojiro KEK, Institute of Particle and Nuclear Studies, Professor, 素粒子原子核研究所, 教授 (20044753)
YAMANAKA Taku Osaka Univesity, Graduate School of Science, Professor, 大学院理学研究科, 教授 (20243157)
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| Project Period (FY) |
2001 – 2006
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| Keywords | Mass Origin / Higgs Particle / Supersymmetry Physics / Proton Antiproton Collider / B Meson / K Meson Rare Decay / Tau Particle Rare Decay / International Collaboration Experiment |
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| Research Abstract |
Since the middle of twentieth century, elementary particle physics has been developed through the processes where particle physics experiments with accelerators have shown that the Standard Model in elementary particle physics predicted the experiment results well. The fundamental part of this Standard Model is that the elementary particle masses originate from the Higgs particle condensation in the vacuum. No experiments have proved this prediction on the origin of mass so far. Whether the origin of mass is based on the Standard Model or on a new theory beyond the Standard Model is the most important subject for the future particle physics. This research project aims at understanding the origin of mass by searching for the Higgs particle both directly and indirectly, and by searching phenomena which contradict with the Standard Model prediction using Factory accelerators.
This project consists of six sub-projects, five on experimental studies and one on theoretical study. Each experime
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ntal study has been performed using particle factory accelerators ( Top factory, B factory and K-factory ) inside and outside of Japan. The theoretical studies have been performed to make appropriate and fast feedback to these experimental studies according to the theoretical studies of the experimental results.
In this project, we obtained the following three major results : Higgs mass was found to be in the narrow range between 114 GeV/c2 and 166 GeV/c2 by the indirect Higgs search with the precision measurement of top quark mass. This helps the direct Higgs search and is a large step towards understanding of the mass origin. Secondly, our experiment results using factory accelerators proved that the Standard Model predicted the experimental results with high precision. As a third, we found a deviation from the Standard Model in the experimental results of CP asymmetry in the b → s penguin decay using B factory accelerator.
These results contributed to the development of particle physics. This development will affect the deep understanding of the early universe. In this project, 31 graduate students obtained PhD. Most of them are now studying on various frontier science subjects inside and outside of Japan. Less
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