We study the origin of baryon resonances which are dynamically generated in the chiral unitary approach.We propose a natural renormalization scheme for the dynamical generation of resonances using the low energy chiral interaction and a general feature of the scattering theory.A deviation of a phenomenological scattering amplitude from the natural one is interpreted by an effective pole term interaction of genuine nature which can not be described by the meson-baryon dynamics,reminiscent of the CDD pole.Applying the present method to physical meson-baryon scatterings,we find that the ∧(1405) resonance is dominated by a meson-baryon component forming a (K)N-π∑ molecular-like structure,while the N(1535) resonance requires some pole contribution.
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