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

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