Date of this Version
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.
Creative Commons License
This work is licensed under a Creative Commons Attribution 2.0 License.
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
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).