Structure of the Lambda(1405) baryon resonance from its large Nc behavior

Details Structure of the Lambda(1405) baryon resonance from its large Nc behavior Structure of the Lambda(1405) baryon resonance from its large Nc behavior

2007-12-20

arxiv.org/abs/0712.3347v2

Phys.Rev.D77:056010,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

RevTeX4, 4 pages, 2 figures, title changed, final version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.056010

We study the behavior with the number of colors (Nc) of the two poles associated to the Lambda(1405) resonance obtained dynamically within the chiral unitary approach. The leading order chiral meson-baryon interaction manifests a nontrivial Nc dependence for SU(3) baryons, which gives a finite attractive interaction in some channels in the large Nc limit. As a consequence, the SU(3) singlet (Kbar N) component of the Lambda(1405) survives in the large Nc limit as a bound state, while the other components dissolve into the continuum. The Nc dependence of the decay widths shows different behavior from the general counting rule for a qqq state, indicating the dynamical origin of the two poles for the Lambda(1405) resonance.

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