Heavy baryon spectrum with chiral multiplets of scalar and vector diquarks

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...

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Bibliographic Details
Published in:Physical review. D 2021-09, Vol.104 (5), p.1, Article 054012
Main Authors: Kim, Yonghee, Liu, Yan-Rui, Oka, Makoto, Suzuki, Kei
Format: Article
Language:English
Subjects:
Baryons
Charm (particle physics)
Excitation
Flavor (particle physics)
Interaction parameters
Parity
Quantum chromodynamics
Quark models
Quarks
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Summary: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 (Q = c, b), we construct a heavy-quark–diquark model. The spectra of the positive- and negative-parity states of ΛQ, ΣQ, ΞQ(′), and ΩQ 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 ΞQ (flavor 3) are different from those of ΛQ, because of the inverse hierarchy of the pseudoscalar diquark. On the other hand, ΣQ, ΞQ′, and ΩQ (flavor 6) baryons have similar spectra. We compare our results of the heavy-quark–diquark model with experimental data as well as the quark model.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.104.054012