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elastic scattering in the momentum range 0.44-0.80 GeV/cNanamura, Takuya; Fujita, Manami; Hasegawa, Shoichi; Ichikawa, Masaya; Ichikawa, Yudai; Imai, Kenichi*; Naruki, Megumi; Sato, Susumu; Sako, Hiroyuki; Tamura, Hirokazu; et al.
Progress of Theoretical and Experimental Physics (Internet), 2022(9), p.093D01_1 - 093D01_35, 2022/09
Times Cited Count：5 Percentile：67.44(Physics, Multidisciplinary)Kim, Y.*; Liu, Y.-R.*; Oka, Makoto; Suzuki, Kei
Physical Review D, 104(5), p.054012_1 - 054012_18, 2021/09
Times Cited Count：12 Percentile：74.69(Astronomy & Astrophysics)Chiral effective theory of scalar and vector diquarks is formulated according to the linear sigma model. The main application is to describe the ground and excited states of singly heavy baryons with a charm or bottom quark. Applying the potential quark model between the diquark and the heavy quark (
), we construct a heavy-quark-diquark model. The spectra of the positive- and negative-parity states of 
, 
, 
and 
are obtained. The masses and interaction parameters of the effective theory are fixed partly from the lattice QCD data and also from fitting low-lying heavy baryon masses. We find that the negative parity excited states of 
(flavor 
) are different from those of , because of the inverse hierarchy of the pseudoscalar diquark. On the other hand, 
and (flavor 
) baryons have similar spectra. We compare our results of the heavy-quark-diquark model with experimental data as well as the quark model.
anomalyKawakami, Yohei*; Harada, Masayasu*; Oka, Makoto; Suzuki, Kei
Physical Review D, 102(11), p.114004_1 - 114004_9, 2020/12
Times Cited Count：7 Percentile：47.3(Astronomy & Astrophysics)We study strong and radiative decays of excited singly heavy baryons using an effective chiral Lagrangian based on the diquark picture. The effective Lagrangian contains a anomaly term, which is found to suppress the decay width of 
.
*(2380)Kim, H.*; Kim, K. S.*; Oka, Makoto
Physical Review D, 102(7), p.074023_1 - 074023_10, 2020/10
Times Cited Count：14 Percentile：70.16(Astronomy & Astrophysics)no abstracts in English
Komatsu, Yusuke*; Ichikawa, Yudai; Naruki, Megumi*; Tanida, Kiyoshi; 24 of others*
JPS Conference Proceedings (Internet), 26, p.022029_1 - 022029_4, 2019/11
Hiyama, Emiko; Hosaka, Atsushi; Oka, Makoto; Richard, J.-M.*
Physical Review C, 98(4), p.045208_1 - 045208_8, 2018/10
Times Cited Count：43 Percentile：95.61(Physics, Nuclear)A quark model, which reproduces the ground-state mesons and baryons, i.e., the threshold energies, is applied to the 
configurations, where 
is a light quark and 
the charmed quark. In the calculation, several open channels are explicitly included such as 
, 
, 
, etc. To distinguish genuine resonances and estimate their width, we employ Gaussian Expansion Method supplemented by the real scalingmethod (stabilization). No resonance is found at the energies of the 
and 
pentaquarks. On the other hand, there is a sharp resonant state at 4690 MeV with 
state and another one at 4920 MeV with 
state, which have a compact structure.
potential modelMaeda, Saori*; Oka, Makoto; Liu, Y.-R.*
Physical Review C, 98(3), p.035203_1 - 035203_9, 2018/09
Times Cited Count：10 Percentile：65.56(Physics, Nuclear)We calculate two-body 
, and 
resonance states of 
(
, 
, or 
) and 
using the complex scaling method. We employ the 
-CTNN potentials, which were proposed in our previous study, and obtain four resonances near 
and 
thresholds. From the analysis by the binding energies of partial channel systems, we conclude that these resonance states are Feshbach resonances. We compare the results with the resonance states in the heavy quark limit, where the and thresholds are degenerate, and find that they form two pairs of the heavy-quark doublets in agreement with the heavy quark spin symmetry.
reactions at J-PARCSako, Hiroyuki
JPS Conference Proceedings (Internet), 17, p.063004_1 - 063004_2, 2017/07
N*, 
baryon excited states have been studied for a long time, but many of high mass states have not been found yet. Recent theoretical studies clarified that 
channels have large contributions to these high mass states. Therefore we have proposed an experiment at J-PARC (E45) to measure 
reactions. In this presentation, we will show the overview of the experiment and current status of detector developments.
Akimura, Yuka; Maruyama, Toshiki; Yoshinaga, Naotaka*; Chiba, Satoshi
Acta Physica Hungarica A, 27(2-3), p.355 - 358, 2006/10
no abstracts in English
= +1 Baryon resonance in photoproduction from the neutronNakano, Takashi*; Ahn, D. S.*; Ahn, J. K.*; Akimune, Hidetoshi*; Asano, Yoshihiro; Chang, W. C.*; Date, S.*; Ejiri, Hiroyasu*; Fujimura, Hisako*; Fujiwara, Mamoru; et al.
Physical Review Letters, 91(1), p.012002_1 - 012002_4, 2003/07
Times Cited Count：1006 Percentile：99.86(Physics, Multidisciplinary)no abstracts in English
Nara, Yasushi; Otsuka, Naohiko; Onishi, Akira*; Maruyama, Tomoyuki
Progress of Theoretical Physics Supplement, (129), p.33 - 37, 1997/00
no abstracts in English
Imai, Kenichi
no journal, ,
Recent Lattice QCD calculations have suggested a possible existence of H-dibaryon near the threshold. In the previous experiments at KEK-PS, a hint of peak structure was observed in the invariant mass spectrum at just above the threshold. An experiment to search for the H-dibaryon through 
p 
and 
mass spectra was proposed at J-PARC (E42). Much better statistics and mass resolution than the previous data are expected. For this experiment, we have been constructing a novel hyperon spectrometer with use of a GEM-TPC and a superconducting Helmholtz magnet. The expected performance of the spectrometer and the proposed experiment is reported based on the R&D results of the TPC and simulations. Possible physics with the hyperon spectrometer other than the H-dibaryon is also discussed.
Sako, Hiroyuki; Imai, Kenichi; Sato, Susumu
no journal, ,
In J-PARC, possibility of a future heavy-ion program has been discussed. In particular, we discuss heavy ion accelerator schemes, physics goals, and experimental setups. There are two physics subjects included in the program. One is a low energy heavy ion physics, to study unstable nuclei with the linac beam at 1-10 AMeV/c, and the other is a high energy heavy ion physics to explore nuclear physics at a high baryon density with the Main Ring beam at 1-10 AGeV/c. In this work, the latter is presented. In particular, we focus on measurements of lepton pairs in order to study high baryon density, and we also search for exotic hadrons and nuclei. We show a preliminary heavy-ion scheme and design of a heavy ion spectrometer.
Sako, Hiroyuki
no journal, ,
The main goals of the J-PARC heavy-ion project are to explore the QCD phase diagram at high baryon density with heavy ions such as uranium at the beam energies of 1-10 AGeV. We are planning to focus on the electron and muon measurements and rare probe search such as multi-strangeness and charmed hadrons by taking advantage of extremely high beam power at J-PARC. A heavy-ion acceleration scheme has been considered with a new heavy-ion linac and a new booster ring, utilizing the existing 3-GeV Rapid-Cycling Synchrotron, and the 50-GeV Main Ring synchrotron.
dibaryon resonances in the phenomenological potential modelOka, Makoto
no journal, ,
and 
daibaryon resonances are analyzed by the complex scaling method for the phenomenological potential model. We find possible Feshbach resonances.
