Spectrum of heavy baryons in the quark model

Single- and double-heavy baryons are studied in the constituent quark model. The model Hamiltonian is chosen as a standard one with two exceptions: (1) the color-Coulomb term depends on quark masses and (2) an antisymmetric LS (spin-orbit) force is introduced. Model parameters are fixed by the stran...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2015-12, Vol.92 (11), Article 114029
Main Authors: Yoshida, T., Hiyama, E., Hosaka, A., Oka, M., Sadato, K.
Format: Article
Language:English
Subjects:
Baryons
Charm (particle physics)
Cosmology
Gravitation
Quark models
Quarks
Spectra
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Summary:Single- and double-heavy baryons are studied in the constituent quark model. The model Hamiltonian is chosen as a standard one with two exceptions: (1) the color-Coulomb term depends on quark masses and (2) an antisymmetric LS (spin-orbit) force is introduced. Model parameters are fixed by the strange baryon spectra, A and [Sigma] baryons. The masses of the observed charmed and bottomed baryons are, then, fairly well reproduced. Our focus is on the low-lying negative-parity states, in which the heavy baryons show specific excitation modes reflecting the mass differences of heavy and light quarks. By changing quark masses from the SU(3) limit to the strange quark mass, and, further, to the charm and bottom quark masses, we demonstrate that the spectra change from the SU(3) symmetry patterns to the heavy-quark-symmetry ones.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.92.114029