Abstract
We study the behavior with the number of colors () of the two poles associated to the resonance obtained dynamically within the chiral unitary approach. The leading order chiral meson-baryon interaction manifests a nontrivial dependence for SU(3) baryons, which gives a finite attractive interaction in some channels in the large limit. As a consequence, the SU(3) singlet () component of the survives in the large limit as a bound state, while the other components dissolve into the continuum. The dependence of the decay widths shows different behavior from the general counting rule for a state, indicating the dynamical origin of the two poles for the resonance.
- Received 20 December 2007
DOI:https://doi.org/10.1103/PhysRevD.77.056010
©2008 American Physical Society