Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks

Kim, Y.*; Liu, Y.-R.*; Oka, Makoto; Suzuki, Kei

Physical Review D, 104(5), p.054012_1 - 054012_18, 2021/09

https://doi.org/10.1103/PhysRevD.104.054012

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.

Resonance states in the potential model

Maeda, Saori*; Oka, Makoto; Liu, Y.-R.*

Physical Review C, 98(3), p.035203_1 - 035203_9, 2018/09

https://doi.org/10.1103/PhysRevC.98.035203

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.

Charmed baryon spectroscopy from lattice QCD near the physical point

Gubler, P.

no journal, ,