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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 言語種別 | 英語 |
| 発行・発表の年月 | 2012/12 |
| 形態種別 | 研究論文（国際会議プロシーディングス） |
| 査読 | 査読あり |
| 標題 | A search for phi meson nucleus bound state using antiproton annihilation on nucleus |
| 執筆形態 | その他 |
| 掲載誌名 | HYPERFINE INTERACTIONS |
| 出版社・発行元 | SPRINGER |
| 巻・号・頁 | 213(1-3),pp.23-29 |
| 著者・共著者 | H. Ohnishi,P. Buehler,M. Cargnelli,C. Curceanu,C. Guaraldo,O. Hartmann,K. Hicks,M. Iwasaki,T. Ishiwatari,P. Kienle,J. Marton,R. Muto,M. Naruki,M. Niiyama,H. Noumi,S. Okada,A. Romero Vidal,A. Sakaguchi,F. Sakuma,S. Sawada,D. Sirghi,F. Sirghi,K. Suzuki,K. Tsukada,O. Vazquez Doce,E. Widmann,S. Yokkaichi,J. Zmeskal |
| 概要 | The mass shift of the vector mesons in nuclei is known to be a powerful tool for investigating the mechanism of generating hadron mass from the QCD vacuum. The mechanism is known to be the spontaneous breaking of chiral symmetry. In 2007, KEK-PS E325 experiment reported about 3.4% mass reduction of the phi meson in medium-heavy nuclei (Cu). This result is possibly one of the indications of the partial restoration of chiral symmetry in nuclei, however, unfortunately it is hard to make strong conclusions from the data. One of the ways to conclude the strength of the phi meson mass shift in nuclei will be by trying to produce only slowly moving phi mesons where the maximum nuclear matter effect can be probed. The observed mass reduction of the phi meson in the nucleus can be translated as the existence of an attractive force between phi meson and nucleus. Thus, one of the extreme conditions that can be achieved in the laboratory is indeed the formation of a phi-nucleus bound state, where the phi meson is "trapped" in the nucleus. The purpose of the experiment is to search for a f-nucleus bound state and measure the binding energy of the system. We will demonstrate that a completely background-free missing-mass spectrum can be obtained efficiently by ((p) over bar, phi) spectroscopy together with K+ Lambda tagging, using the primary reaction channel (p) over barp --> phi phi. This paper gives an overview of the physics motivation and the detector concept, and explains the direction of the initial research and development effort. |
| DOI | 10.1007/s10751-012-0647-y |
| ISSN | 0304-3843 |