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

H. Sako, Jung Keun Ahn, K. Y. Baek, B. Bassalleck, H. Fujioka, L. Guo, S. Hasegawa, K. Hicks, R. Honda, S. H. Hwang, Y. Ichikawa, M. Ieiri, K. Imai, S. H. Kim, R. Kiuchi, H. S. Lee, K. Nakazawa, M. Naruki, A. Ni, M. NiiyamaK. Ozawa, J. Y. Park, S. H. Park, S. Y. Ryu, S. Sato, K. Shirotori, H. Sugimura, M. Sumihara, K. Tanida, H. Takahashi, T. Takahashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


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 10 6 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.

Original languageEnglish
Title of host publicationEPJ Web of Conferences
Publication statusPublished - 2014
Externally publishedYes
Event2013 International Nuclear Physics Conference, INPC 2013 - Firenze, Italy
Duration: 2013 Jun 22013 Jun 7


Other2013 International Nuclear Physics Conference, INPC 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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., ... Takahashi, T. (2014). Search for H-dibaryon at J-PARC with a Large Acceptance TPC. In EPJ Web of Conferences (Vol. 66). [09015]