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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：95.54(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：12 Percentile：65.16(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.
