| Project/Area Number |
10640282
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | Kogakuin University |
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Principal Investigator |
KATO Kiyoshi Kogakuin U., Faculty of Engineering, professor, 工学部, 教授 (50152707)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAZAWA Nobuya Kogakuin U., Faculty of Engineering, professor, 工学部, 教授 (50100342)
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| Project Period (FY) |
1998 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1999: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1998: ¥1,200,000 (Direct Cost: ¥1,200,000)
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| Keywords | High Energy Physics / Standard Model in Particle Physics / Automation in Perturbation / Radiative Correction / Electron-Positron Collision / New Particle Search / Non-Linear Gauge |
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| Research Abstract |
The main goal of this research project is to calculate the radiative corrections to the four-fermion production in electron-positron collisions based on the standard model and, if possible, on the supersymmetric models. The calculation is essential for the precise understanding of W-physics in the LEP-II experiments.
In this project, we have achieved the followings.
We computed the one-loop radiative correction to W and two fermions production. Though the process is simpler than the target process, this work has two off-springs : First, it can check the function of automated systems. Second but more important point is that it enables us to estimate the discrepancy from the computation based on the factorization. We found 1-2% deviation from the factorized results, so that the full one-loop calculation is necessary for the full understanding of the W pair production.
Also, in this project, we have introduced the automated system a new mechanism to check the large-scale computation. The use of generalized non-linear gauge is used as a useful diagnostics. The validity of this check is demonstrated through the explicit computation for various two-to-two processes.
Unfortunately, the final item, the development of a practical event generator, is not yet finished within the term of the project. It is expected that it will be end within a year.
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