Abstract
We study the origin of the resonances associated with pole singularities of the scattering amplitude in the chiral unitary approach. We propose a “natural renormalization” scheme using the low-energy interaction and the general principle of the scattering theory. We develop a method to distinguish dynamically generated resonances from genuine quark states [Castillejo-Dalitz-Dyson (CDD) poles] using the natural renormalization scheme and phenomenological fitting. Analyzing physical meson-baryon scatterings, we find that the resonance is largely dominated by the meson-baryon molecule component. In contrast, the resonance requires a sizable CDD pole contribution, while the effect of the meson-baryon dynamics is also important.
- Received 17 March 2008
DOI:https://doi.org/10.1103/PhysRevC.78.025203
©2008 American Physical Society