Search for H-dibaryon at J-PARC with a Large Acceptance TPC

Authors

H. Sako, Japan Atomic Energy Agency
J. K. Ahn, Pusan National University
K. Y. Baek, Pusan National University
B. Bassalleck, University of New Mexico
H. Fujioka, Kyoto University
Lei Guo, Department of Physics, Florida International UniversityFollow
S. Hasegawa, Japan Atomic Energy Agency
K. Hicks, Ohio University
R. Honda, Tohoku University
S. H. Hwang, Japan Atomic Energy Agency
Y. Ichikawa, Japan Atomic Energy Agency; Kyoto University
M. Ieri, High Energy Accelerator Research Organization
K. Imai, Japan Atomic Energy Agency
S. H. Kim, Pusan National University
R. Kiuchi, Japan Atomic Energy Agency; Seoul National University
H. S. Lee, Pusan National University
K. Nakazawa, Gifu University
M. Naruki, High Energy Accelerator Research Organization
A. Ni, Pusan National University
M. Niiyama, Kyoto University
K. Ozawa, High Energy Accelerator Research Organization
J. Y. Park, Pusan National University
S. Y. Ryu, Pusan National University
S. Sato, Japan Atomic Energy Agency
K. Shirotori, Osaka University
H. Sugimura, Japan Atomic Energy Agency; Kyoto University
M. Sumihara, Gifu University
K. Tanida, Japan Atomic Energy Agency; Seoul National University
H. Takahashi, High Energy Accelerator Research Organization
T. Takahashi, High Energy Accelerator Research Organization

Date of this Version

2014

Document Type

Article

Abstract

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  threshold. E224 and E522 experiments at KEK observed peaks in  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  and 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 4 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.

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This work is licensed under a Creative Commons Attribution 2.0 License.

Comments

Originally published in EPJ Web Conferences.

Recommended Citation

Search for H-dibaryon at J-PARC with a Large Acceptance TPC Sako H., Ahn J. K., Baek K. Y., Bassalleck B., Fujioka H., Guo L., Hasegawa S., Hicks K., Honda R., Hwang S. H., Ichikawa Y., Ieiri M., Imai K., Kim S. H., Kiuchi R., Lee H. S., Nakazawa K., Naruki M., Ni A., Niiyama M., Ozawa K., Park J. Y., Park S. H., Ryu S. Y., Sato S., Shirotori K., Sugimura H., Sumihara M., Tanida K., Takahashi H., Takahashi T. EPJ Web of Conferences. 2014;66:09015 DOI 10.1051/epjconf/20146609015