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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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| 発行・発表の年月 | 2014 |
| 形態種別 | その他 |
| 標題 | Search for H-dibaryon at J-PARC with a Large Acceptance TPC |
| 執筆形態 | その他 |
| 掲載誌名 | EPJ Web of Conferences |
| 巻・号・頁 | 66 |
| 著者・共著者 | H. Sako,J. K. Ahn,K. Y. Baek,B. Bassalleck,H. Fujioka,L. Guo,S. Hasegawa,K. Hicks,R. Honda,S. H. Hwang,Y. Ichikawa,Y. Ichikawa,M. Ieiri,K. Imai,S. H. Kim,R. Kiuchi,R. Kiuchi,H. S. Lee,K. Nakazawa,M. Naruki,A. Ni,M. Niiyama,K. Ozawa,J. Y. Park,S. H. Park,S. Y. Ryu,S. Sato,K. Shirotori,H. Sugimura,H. Sugimura,M. Sumihara,K. Tanida,K. Tanida,H. Takahashi,T. Takahashi |
| 概要 | H-dibaryon has been predicted as a stable 6-quark color-singlet state. It has been searched for by many experiments but has never been discovered. Recent lattice QCD calculations predict H-dibaryon as a weakly bound or a resonant state close to the LL threshold. E224 and E522 experiments at KEK observed peaks in LL invariant mass spectra near the threshold in (K-, K +) reactions, which were statistically not significant. Therefore, we proposed a new experiment E42 at J-PARC. It will measure decay products of ΛΛ and Λπ-p in a (K-, K +) reaction. We design a large acceptance spectrometer based on a Time Projection Chamber (TPC) immersed in a dipole magnetic field. The TPC surrounds a target to cover nearly 4π acceptance, and accepts K- beams up to 106 counts per second. To suppress drift field distortion at high beam rates, we adopt Gas Electron Multipliers (GEMs) for electron amplification and a gating grid. We show an overview of the experiment, the design of the spectrometer, and the R&D status of the TPC prototype. © Owned by the authors, published by EDP Sciences, 2013. |
| DOI | 10.1051/epjconf/20146609015 |
| ISSN | 2101-6275/2100-014X |
| PermalinkURL | http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84898768568&origin=inward |