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

Abstract

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.

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

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Cited by in corpus (31)

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• Low-lying even parity meson resonances and spin-flavor symmetry
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• Quark mass dependence of H-dibaryon in $\Lambda \Lambda$ scattering
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• The ${\Lambda }_c(2595)$ resonance as a dynamically generated state: the compositeness condition and the large $N_c$ evolution
• Production of $N^{\ast }(1535)$ and $N^{\ast }(1650)$ in ${\Lambda }_c\to {\bar{K}}^0\eta p$ $(\pi N)$ decay
• SU(6) $[70,1^{-}]$ baryon multiplet in the $1/N_c$ expansion
• Recent developments in antikaon-nucleon dynamics
• Lambda(1405) in chiral SU(3) dynamics
• Meson-baryon nature of Lambda(1405) in chiral dynamics
• What We Know About the Lambda(1405)
• Antikaon-nucleon dynamics and its application to few-body systems
• Origin of resonances in chiral dynamics
• Chiral dynamics and baryon resonances