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Based on chiral unitary approach, we construct the realistic KbarN localpotential, which is useful for the quantitative calculation of Kbar-nuclei.Since the resonance pole structure of the KbarN system seems important for theKbar-nuclei and the spacial structure of Lambda(1405), we establish theconstruction procedure of the local potential paying attention to thescattering amplitude in the complex energy plane. Furthermore, for thequantitative study of the Kbar-nuclei, we consider the constraint from therecent experimental data measured by SIDDHARTA, which significantly reduces theuncertainty of the KbarN amplitude. With this new local potential, we estimatethe spacial structure of Lambda(1405) and obtain the result indicating themeson-baryon molecular state of Lambda(1405).

Construction of KbarN potential and structure of Lambda(1405) based on chiral unitary approach