A Resonance Model of Baryons without Parity Doublets Based on Duality and Quark Modell)

An s-channel resonance model of baryons is presented on the basi ~ of duality in the sense of finite-energy sum rule and the harmonic oscillator quark model. This model avoids unwanted parity doublets by introducing non-degenerate parity partners and also att~mpts to avoid ghosts. It is shown that peripheral resonances with the impact parameter ""'1 fermi dominate thf! imaginary part of amplitude thus constructed. As is well known, the concept of duality for hadrons in the sense of finite-energy sum rules (FESR) l) has convincing experimental support. On the other hand, the quark model scheme2> of hadrons based on the harmonic oscillator spectrum also continues to provide us with a most economical framework fo