Abstract
Λ(1405) is investigated as a resonance in a coupled channel baryon-meson [Formula: see text] scattering with a 'bound state embedded in the continuum' (BSEC). This BSEC is introduced by hand, as a state not originated from a simple baryon-meson system. We assume it comes from the three-quark state. There appears a resonance of a large width in the Σπ scattering below the [Formula: see text] threshold by assuming the baryon meson interaction whose channel dependence is (1) flavor-flavor type like the chiral unitary approach, (2) flavor-flavor type with a lower-momentum cut-off, or (3) the same as that of the quark cluster model. It is necessary to introduce a BSEC for the latter two cases in order to reproduce the peak. The calculation including a BSEC seems to be preferable to reproduce the [Formula: see text] scattering length. Our calculation gives the observed value when the BSEC contribution to the resonance is roughly half of that of the [Formula: see text] channel.
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