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The structures of the hyperon resonance $\Lambda (1405)$ and the scalarmesons $\sigma$, $f_{0}(980)$, and $a_{0}(980)$ are investigated based on thecoupled-channels chiral dynamics with finite volume effect. The finite volumeeffect is utilized to extract the coupling constant, compositeness, and meansquared distance between two constituents of a Feshbach resonance state as wellas a stable bound state. In this framework, the real-valued size of theresonance can be defined from the downward shift of the resonance poleaccording to the decreasing finite box size $L$ on a given closed channel. As aresult, we observe that, when putting the $\bar{K}N$ and $K\bar{K}$ channelsinto a finite box while other channels being unchanged, the poles of the higher$\Lambda (1405)$ and $f_{0}(980)$ move to lower energies while other poles donot show downward mass shift, which implies large $\bar{K}N$ and $K\bar{K}$components inside higher $\Lambda (1405)$ and $f_{0}(980)$, respectively.Extracting structures of $\Lambda (1405)$ and $f_{0}(980)$ in our method, wefind that the compositeness of $\bar{K}N$ ($K\bar{K}$) inside $\Lambda (1405)$[$f_{0}(980)$] is 0.82-1.03 (0.73-0.97) and the mean distance between twoconstituents is evaluated as 1.7-1.9 fm (2.6-3.0 fm).

Size measurement of dynamically generated hadronic resonances with finite volume effect