| Project/Area Number |
15540292
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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 | Okayama University of Science |
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Principal Investigator |
MIYAGAWA Kazuya Okayama University of Science, Faculty of Science, Professor, 理学部, 教授 (70219731)
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| Co-Investigator(Kenkyū-buntansha) |
FUJIWARA Yoshikazu Kyoto University, graduate school of Science, lecturer, 大学院・理学研究科, 講師 (70199397)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2005: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | K meson / hyper nucleus / hyperon / strangeness / international collaboration / Germany / ドイツ:スペイン |
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| Research Abstract |
The aim of this work is to analyze the reactions K^-+d→π+A(Σ)+N,K^-+d→K^++Ξ+N and to get information on ΛΝ-ΣΝ and ΞΝ-ΛΛ-ΛΣ-ΣΣ interactions. In order to perform reliable analyses we lay special importance on the collaboration with the groups developing realistic 2-body interactions, like A.Ramos and E.Oset (K^^-N interaction), the Nijmegen group, and Kyoto-Niigata group (baryon-baryon interactions). Also, the development of relativistic treatment of these coupled systems is one of the main issues because the transition occurs to the system including small-mass pion.
The K^^-N amplitude by Oset and Ramos is coupled to possible channels and reproduces various experimental data with a small number of parameter. We extend their amplitude to the off-energy-shell region in the collaboration with A.Ramos. Also we finish the preparation to incorporate the Nijmegen Extended Soft Core interaction (transferred to the p-space representation) and Kyoto-Niigata quark-cluster-model interaction (RGM kernels) to our analyses mention above.
The relativistic treatment of 3-body systems is a serious issue. Often the Bete-Salpeter equation has been used, but we have extended the Bakamjian-Thomas formalism to the ΚΝΝ-πΣΝ-πΛΝ system, because the nonrelativistic ingredients (for example, a realistic deuteron wave function) are well combined with this formalism. We investigate the 3-body kinematics and the boost of 2-body interactions from c.m. frame to the general frame.
As mentioned above we have not reached to the aim originally expected, but we have solved the essential problems for the present analyses.
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