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We construct an effective hadronic model including $\Lambda_c(2595)$,$\Lambda_c(2625)$, $\Lambda_b(5912)$ and $\Lambda_b(5920)$ regarding them aschiral partners to $\Sigma_c(2455)$, $\Sigma_c(2520)$, $\Sigma_b$ and$\Sigma_b^\ast$, respectively, with respecting the chiral symmetry andheavy-quark spin-flavor symmetry. We determine the model parameters from theexperimental data for relevant masses and decay widths of $\Sigma_c^{(\ast)}$and $\Lambda_c(2595)$. Then, we study the decay widths of $\Lambda_c(2625)$,$\Lambda_b(5912)$ and $\Lambda_b(5920)$. We find that, although the decay of$\Lambda_c(2595)$ is dominated by the resonant contribution through$\Sigma_c(2455)$, non-resonant contributions are important for$\Lambda_c(2625)$, $\Lambda_b(5912)$ and $\Lambda_b(5920)$, which reflects thechiral partner structure. We also study the radiative decays of the baryons,and show that each of their widths is determined from the radiative decay widthof their chiral partners.

Analysis of $\Lambda_c(2595)$, $\Lambda_c(2625)$, $\Lambda_b(5912)$, $\Lambda_b(5920)$ based on a chiral partner structure