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We study the origin of the resonances associated with pole singularities ofthe scattering amplitude in the chiral unitary approach. We propose a "naturalrenormalization" scheme using the low-energy interaction and the generalprinciple of the scattering theory. We develop a method to distinguishdynamically generated resonances from genuine quark states[Castillejo-Dalitz-Dyson (CDD) poles] using the natural renormalization schemeand phenomenological fitting. Analyzing physical meson-baryon scatterings, wefind that the Lambda(1405) resonance is largely dominated by the meson-baryonmolecule component. In contrast, the N(1535) resonance requires a sizable CDDpole contribution, while the effect of the meson-baryon dynamics is alsoimportant.

Origin of resonances in the chiral unitary approach