Lambda(1405) as a Resonance in the Baryon-Meson Scattering Coupled to the q^3 State in a Quark Model

Abstract

In order to describe Lambda(1405) as a resonance in the baryon-meson scattering, we have investigated q^3-q qbar scattering system with the flavor-singlet q^3 (0s)^2(0p) state (the Lambda^1 pole). The scattering is treated by the quark cluster model (QCM). The Lambda^1 pole is treated as a bound state embedded in the continuum. We found that the peak appears below the N Kbar threshold in the spin one half, isospin 0 channel even if the mass of the Lambda^1 pole is above the threshold. This peak disappears when the coupling to the Lambda^1 pole is switched off. To use the observed hadron mass in the kinetic part of QCM is also found to be important to reproduce a peak just below the N Kbar threshold.

arXiv comment16 pages and 7 figures

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• Meson-baryon threshold effects in the light-quark baryon spectrum
• Lambda(1405) in a baryon-meson scattering with a bound state embedded in the continuum
• A possible interpretation of $\Lambda$ baryon spectrum with pentaquark components
• A new molecular dynamics calculation and its application to the spectra of light and strange baryons
• The ccbar Pentaquarks by a Quark Model