Can the SU(3) chiral quark soliton model describe the nucleon properties better than the SU(2) model?

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.54.2161· OSTI ID:286424

Wakamatsu, M ^[1]

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1. Department of Physics, Faculty of Science, Osaka University, Toyonaka, Osaka 560 (Japan)

A comparative analysis of the {pi}{ital N} {sigma} term is carried out within the flavor SU(2) as well as the SU(3) versions of the chiral quark soliton model. The validity of the latter model relies upon the approximate degeneracy of the strange and nonstrange quark masses, since its basic dynamical assumption, i.e., the SU(3) symmetric collective quantization and the subsequent perturbative treatment of the strange quark mass, is justified only on such a condition. We argue that a relatively large admixture of the {ital s{bar s}} component in the nucleon is a characteristic feature of this SU(3) symmetric rotation, but it simultaneously predicts a considerably small {pi}{ital N} {sigma} term as compared with the prediction of the SU(2) model, which is interpreted as indicating a limitation of the SU(3) collective coordinate approach to the physics of the strangeness content of the nucleon. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 286424
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 54; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CHIRAL SYMMETRY
MASS
NUCLEONS
QUARK MODEL
S QUARKS
SOLITONS
STRANGENESS
SU-2 GROUPS
SU-3 GROUPS