| Project/Area Number |
15540297
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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 (2004)
The High Energy Accelerator Research Organization (2003) |
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Principal Investigator |
KATAYAMA Nobuhiko High Energy Accelerator Research Organization, Institute of Particle and Nuclear, Professor, 素粒子原子核研究所, 教授 (50290854)
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| Co-Investigator(Kenkyū-buntansha) |
AKAI Kazunori High Energy Accelerator Research Organization, Accelerator Laboratory, Associate Professor, 加速器研究施設, 助教授 (10184061)
OZAKI Hitoshi High Energy Accelerator Research Organization, Institute of Particle and Nuclear, Research Assistant, 素粒子原子核研究所, 助手 (10177214)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,600,000 (Direct Cost: ¥3,600,000)
Fiscal Year 2004: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2003: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Elementary particle experiment / Detector / Accelerator / B factory / 素粒子 / ビームパイプ / Super KEKB / B中間子 / 超対称性 / 衝突点ビームパイプ / Bファクトリー / Geant4 / B->Dτν / Bs mixing |
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| Research Abstract |
We studied design parameters for the super flat interaction region beam pipe. Following the study done previous years, we set the inner dimension of the beam pipe to be 1mm high, 10mm wide and 16 mm long. We then studied the material and thickness of the beam pipe and se decided to use 500 micron thick Beryllium as the vacuum wall. We then used the design parameter to simulate the physics processes for the B factory using GEANT4 detector simulation tool developed at CERN. This year, we studied to separate B and anti B meson production from continuum quark-anti quark pair production from the electron positron collision. For decay mode where B meson decaying into K meson and pi meson the resolution of the decay vertex improves from about 49 micron to 15 micron when using the super flat beam pipe while the resolution of the tag side vertex improves from about 103 microns to 24 micron, thus resulting the improvement in vertex separation from 130 microns to 38 microns. This improves the signal to noise ration about 13〜60% depending on the decay modes
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