Lambda(1405) as a Resonance in the Baryon-Meson Scattering Coupled to the q3 State in a Quark Model
Abstract
In order to describe Lambda(1405) as a resonance in the baryon-meson scattering, we have investigated q3-q qbar scattering system with the flavor-singlet q3 (0s)2(0p) state (the Lambda1 pole). The scattering is treated by the quark cluster model (QCM). The Lambda1 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 Lambda1 pole is above the threshold. This peak disappears when the coupling to the Lambda1 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.
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