ZhETF, Vol. 135,
No. 5,
p. 885 (May 2009)
(English translation - JETP,
Vol. 108, No. 5,
p. 770,
May 2009
available online at www.springer.com
)
SELECTED PROBLEMS OF BARYON SPECTROSCOPY: CHIRAL SOLITON VERSUS QUARK MODELS
Kopeliovich V.B.
Received: December 30, 2008
PACS: 12.39.Dc, 14.20.-c, 14.65.-q, 14.20.Pt
The inconsistency between the rigid rotator and bound state models at an arbitrary number of colors, the rigid rotator - soft rotator dilemma, and some other problems of baryon spectroscopy are discussed in the framework of the chiral soliton approach (CSA). Consequences of the comparison of CSA results with simple quark models are considered and the 1/Nc expansion for the effective strange antiquark mass is presented, as it follows from the CSA. Strong dependence of the effective strange antiquark mass on the SU(3) multiplet is required to fit the CSA predictions. The difference between ``good'' and ``bad'' diquark masses, which is about 100 MeV, is in reasonable agreement with other estimates. Multibaryons (hypernuclei) with strangeness are described and some states of interest are also predicted within the CSA.
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