Modified Quark Models
We discuss the implications of the splitting of the A2 resonance. It leads us to theories where either a 1−+ or another 2 resonance are present. The 1−+ is included in the Gell-Mann-Zweig (4) scheme that we describe in some detail. An additional 2++ can be provided by many models, one of which — the giant quark model — is shortly discussed.
KeywordsQuark Model Quark Field Parity Doublet Simple Quark Equal Mass Particle
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