Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
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.
anomalyHarada, Masayasu*; Liu, Y.-R.*; Oka, Makoto; Suzuki, Kei
Physical Review D, 101(5), p.054038_1 - 054038_11, 2020/03
Times Cited Count：16 Percentile：74.34(Astronomy & Astrophysics)Using a chiral effective theory of diquarks, we analyze the spectrum and structure of diquark and heavy baryons consisting of diquarks. anomaly is considered in the chiral Lagrangian and its effects are studied.
Oka, Makoto; Maeda, Saori*; Liu, Y.-R.*
International Journal of Modern Physics; Conference Series (Internet), 49, p.1960004_1 - 1960004_8, 2019/07
Times Cited Count：6 Percentile：94.54(Astronomy & Astrophysics)The charmed dibaryon resonances are given by a model Hamiltonian with the quark-model based short-range interaction and the long-range meson-exchange interactions. Sharp resonances states below the 
-
and 
- thresholds are predicted.
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.
anomalyOka, Makoto; Harada, Masayasu*; Suzuki, Kei; Liu, Y.-R.*
no journal, ,
Using a chiral effective theory of diquarks, we analyze the spectrum and structure of diquark and heavy baryons consisting of diquarks. UA(1) anomaly is considered in the chiral Lagrangian and its effects are studied.
