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We study strong and radiative decays of excited singly heavy baryons (SHBs)using an effective chiral Lagrangian based on the diquark picture proposed inRef. [1]. The effective Lagrangian contains a $U_A (1)$ anomaly term, whichinduces an inverse mass ordering between strange and non-strange SHBs withspin-parity $1/2^-$. We find that the effect of the $U_A (1)$ anomaly combinedwith flavor-symmetry breaking modifies the Goldberger-Treiman relation for themass difference between the ground state $\Lambda_Q (1/2^+)$ and its chiralpartner $\Lambda_Q (1/2^-)$, and $\Lambda_Q (1/2^-) \Lambda_Q (1/2^+) \eta$coupling, which results in suppression of the decay width of $\Lambda_Q (1/2^-)\to \Lambda_Q (1/2^+) \eta$. We also investigate the other various decays suchas $\Lambda_Q (1/2^-) \to \Sigma_Q (1/2^+, \, 3/2^+) \pi \pi$, $\Lambda_Q(1/2^-) \to \Sigma_Q (1/2^+) \pi$, $\Lambda_Q (1/2^-) \to \Sigma_Q (1/2^+, \,3/2^+) \gamma$, and $\Lambda_Q (1/2^-) \to \Lambda_Q (1/2^+) \pi^0$ for widerange of mass of $\Lambda_Q (1/2^-)$.

Suppression of decay widths in singly heavy baryons induced by the $U_A (1)$ anomaly