| Project/Area Number |
17540283
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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 |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | High Energy Accelerator Research Organization |
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Principal Investigator |
ISHIKAWA Tadashi High Energy Accelerator Research Organizatio, Computing Research Center, Associate Professor, 計算科学センター, 助教授 (90184481)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIMOTO Junpei High energy accelerator research organization, Institute of Particle and Nuclear Studies, Associate Lecturer, 素粒子原子核研究所, 研究機関講師 (90202291)
KURIHARA Yoshimasa High energy accelerator research organization, Institute of Particle and Nuclear Studies, Associate Lecturer, 素粒子原子核研究所, 研究機関講師 (50195559)
KATO Kiyoshi Kogakuin Univ., dep.of Technogoly, Professor, 工学部, 教授 (50152707)
YAMASHITA Satoru Tokyo Univ., International Center for Elementary Physics Particle, Associate Professor, 素粒子物理国際研究センター, 助教授 (60272465)
YASUI Yoshiaki Tokyo Management College, Lecturer, 経営情報学科, 講師 (50389839)
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| Project Period (FY) |
2005 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,700,000 (Direct Cost: ¥1,700,000)
Fiscal Year 2005: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | linear collider / Higgs particle / radiative corrections / multi-precision / supersymmetry / simulation / algorithm / automatic system / 高精密計算 / 国際貢献 / 高精度計算 |
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| Research Abstract |
1. One of the most important goals of the International Linear Collider experiments is the detailed study of Higss particle. With the high-statistics data from devoted efforts by experimentalists, precise theoretical calculations are mandatory. We calculated the full electroweak radiative corrections for Higgs potential in the high energy region using the automated system (GRACE) for the perturbative computation. The calculated weak correction in Gμ scheme is small, less than 5% for > 600GeV. In order to confirm the results, we have made the comparison between ZHH channel and vμvμHH channel, and also the estimation of the weak correction by assuming the dominance of W W -> HH mechanism.
2. We present the renormalization scheme used in and the characteristic features of GRACE/SUSY-loop, the package of the program for the automatic calculation of the minimal supersymmetric standard model processes including one-loop order corrections. The two-body and three-body decay widths of charginos in one-loop order evaluated by GRACE/SUSY-loop are shown.
3. The control of the numerical precision of large-scale computations like those generated by the GRACE system for automatic Feynman diagram calculations has become an instrinsic part of those packages. We tested the 1-loop radiative correction to electron positron tau anti-tau production in electon positron collider, using quadruple and octuple precision arithmetic library where the number of lost-bits is made available.
4. We developed the program which generated FORM sources for its symbolic manipulation. This enables us the efficient memory management that is essential for the handling of a tremendous number of Feynman diagrams, so that the performance is significantly improved.
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