Model-independent study on the structure of Lambda(1405)

Understanding of the internal structure of exotic hadrons is an important topic of the current hadron physics. Particularly in recent years, precise data on the hadron scattering have been accumulated from the experimental analysis, and it is becoming possible to extract detailed information on the scattering amplitude. This enables us to study the hadron structure from the properties of the scattering amplitude. In this talk, we show that the internal structure of hadron resonances is related to the pole position, the scattering length, and the zero of the scattering amplitude. By using the recent analysis of the Lambda(1405) in the meson-baryon scattering, we show that the dominance of the KbarN composite component of the high-mass pole of Lambda(1405) is concluded only with the experimental observables. Furthermore, we also discuss the method to determine the KbarN amplitude from experimental data analysis in a model-independent manner.