| Project/Area Number |
16540252
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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 | Osaka University |
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Principal Investigator |
HOSAKA Atsushi Osaka University, Research Center for Nuclear Physics, Associate Professor, 核物理研究センター, 助教授 (10259872)
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| Co-Investigator(Kenkyū-buntansha) |
TOKI Hiroshi Osaka University, Research Center for Nuclear Physics, Professor, 核物理研究センター, 教授 (70163962)
NAKANO Takashi Osaka University, Research Center for Nuclear Physics, Professor, 核物理研究センター, 教授 (80212091)
永廣 秀子 大阪大学, 核物理研究センター, 特任研究員 (10397838)
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| Project Period (FY) |
2004 – 2006
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| Project Status |
Completed (Fiscal Year 2006)
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| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2006: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2005: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2004: ¥1,000,000 (Direct Cost: ¥1,000,000)
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| Keywords | Pentaquark / Quark model / Photoproductions / Lambda-hyperons / シータ粒子 / エキゾチックバリオン / 光生成生 / マルチクォーク状態 / ストレンジネス / Exotic hadrons / Pentaquarks / Hyporon resonances / Photoproductions |
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| Research Abstract |
In this research, we have investigated the structure and production/decay reactions of pentaquark baryons. We proposed an intuitive method to understand possible five quark structure of the pentaquarks using a conventional quark model. In this way we provided a view to understand the results of chiral quark soliton model. Also, we investigated how five quark structure affect various phenomena such as mass and decay width. In particular, we solved the five quark system precisely including bound as well as scattering states.
In order to extract information of five quark structure from experiments, we investigated reaction mechanism. We consistently used an effective lagrangian method and determine model parameters from symmetries. Having spin and parity of the pentaquark states as unknown parameter, we predicted angular distributions and production rate of the reactions. In a proton-proton reaction, we proposed a method to determine the spin and parity of Theta+.
As a related subject, we investigated properties of hyperon resonances, Lambda(1405) and Lambda(1520) having the strangeness-1 which is opposite to that of the Theta+. The former is know for some time to couple strongly to the anti-kaon and nucleon, and hence was regarded as another candidate of pentaquark states.
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