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K̄N-πY system is a key ingredient for the study of exotic K̄-nuclear system which has been discussed for a long time. In this article, we have studied the K̄N-πY system with a coupled-channel Complex Scaling Method (ccCSM). The ccCSM is expected to deal appropriately with important points in the study of̄ K-nuclear system: 1. coupled-channel problem and 2. resonant states. Here, we report the result of the first application of the ccCSM to the K̄N-πY system, in which we have treated resonance and scattering problems in a single framework of the ccCSM with Gaussian base. We have proposed a chiral SU(3)-based K̄N-πY potential with a Gaussian form in r-space for both isospin 0 and 1 sectors, constrained by the K̄N scattering length. Using this potential, we have calculated theI = 0 scattering amplitudes with the ccCSM and then confirmed a resonance structure. A resonance pole is found around (1418,−21) MeV ((1420,−25) MeV) on the complex-energy plane for non-relativistic (semi-relativistic) kinematics. The meson-baryon mean distance of the resonance is found to be 1 .3−0.3i (1.2−0.5i) fm. Furthermore, using the complex-range Gaussian function as a basis function, we have found another pole in the lower-energy region involving large decay width. These resonances are considered to form the double pole of Λ(1405) as reported in past studies with chiral unitary model. Similarly, we have investigated the I = 1 sector in which three channels of̄ KN, πΣ andπΛ are taken into account.

First application of coupled-channel Complex Scaling Method to the KbarN-piY system