TY - JOUR
T1 - Search for H-dibaryon at J-PARC with a Large Acceptance TPC
AU - Sako, H.
AU - Ahn, J. K.
AU - Baek, K. Y.
AU - Bassalleck, B.
AU - Fujioka, H.
AU - Guo, L.
AU - Hasegawa, S.
AU - Hicks, K.
AU - Honda, R.
AU - Hwang, S. H.
AU - Ichikawa, Y.
AU - Ieiri, M.
AU - Imai, K.
AU - Kim, S. H.
AU - Kiuchi, R.
AU - Lee, H. S.
AU - Nakazawa, K.
AU - Naruki, M.
AU - Ni, A.
AU - Niiyama, M.
AU - Ozawa, K.
AU - Park, J. Y.
AU - Park, S. H.
AU - Ryu, S. Y.
AU - Sato, S.
AU - Shirotori, K.
AU - Sugimura, H.
AU - Sumihara, M.
AU - Tanida, K.
AU - Takahashi, H.
AU - Takahashi, T.
N1 - Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014
Y1 - 2014
N2 - 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.
AB - 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.
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U2 - 10.1051/epjconf/20146609015
DO - 10.1051/epjconf/20146609015
M3 - Conference article
AN - SCOPUS:84898768568
VL - 66
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
SN - 2101-6275
M1 - 09015
T2 - 2013 International Nuclear Physics Conference, INPC 2013
Y2 - 2 June 2013 through 7 June 2013
ER -