A review of level-ordering theorems showing local potential quark models force the Roper resonance above the negative-parity excitations, plus related spectral inequalities.
Zweig, Origins of the Quark Model , Baryon 1980
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Level order of quark systems: The puzzle of the Roper resonance, and related questions
A review of level-ordering theorems showing local potential quark models force the Roper resonance above the negative-parity excitations, plus related spectral inequalities.