EPJ Web of Conferences (Mar 2014)
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.
Affiliations
- Sako H.
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
- Ahn J. K.
- Department of Physics, Pusan National University
- Baek K. Y.
- Department of Physics, Pusan National University
- Bassalleck B.
- Department of Physics and Astronomy, The University of New Mexico
- Fujioka H.
- Department of Physics, Kyoto University
- Guo L.
- Department of Physics, Florida International University
- Hasegawa S.
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
- Hicks K.
- Department of Physics and Astronomy, Ohio University
- Honda R.
- Department of Physics, Tohoku University
- Hwang S. H.
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
- Ichikawa Y.
- Ieiri M.
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)
- Imai K.
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
- Kim S. H.
- Department of Physics, Pusan National University
- Kiuchi R.
- Lee H. S.
- Department of Physics, Pusan National University
- Nakazawa K.
- Faculty of Education, Gifu University
- Naruki M.
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)
- Ni A.
- Department of Physics, Pusan National University
- Niiyama M.
- Department of Physics, Kyoto University
- Ozawa K.
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)
- Park J. Y.
- Department of Physics, Pusan National University
- Park S. H.
- Department of Physics, Pusan National University
- Ryu S. Y.
- Department of Physics, Pusan National University
- Sato S.
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
- Shirotori K.
- Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)
- Sugimura H.
- Sumihara M.
- Faculty of Education, Gifu University
- Tanida K.
- Takahashi H.
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)
- Takahashi T.
- Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)
- DOI
- https://doi.org/10.1051/epjconf/20146609015
- Journal volume & issue
-
Vol. 66
p. 09015
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 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.
