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The nonleptonic decay $\Xi^0_c \to \Lambda^+_c \pi^-$ with $\Delta C=0$ issystematically studied in the framework of the covariant confined quark modelwith accounting for both short and long distance effects. The short distanceeffects are induced by four topologies of external and internal weak $W^\pm$exchange, while long distance effects are saturated by an inclusion of theso-called pole diagrams with an intermediate $\frac12^+$ and $\frac12^-$ baryonresonances. The contributions from $\frac12^+$~resonances are calculatedstraightforwardly by accounting for single charmed $\Sigma^0_c$ and$\Xi^{'\,+}_c$~baryons whereas the contributions from $\frac12^-$~resonancesare calculated by using the well-known soft-pion theorem in the current-algebraapproach. It allows to express the parity-violating S-wave amplitude in termsof parity-conserving matrix elements. It is found that the contribution ofexternal and internal $W$-exchange diagrams is significantly suppressed by morethan one order of magnitude in comparison with data. The pole diagrams play themajor role to get consistency with experiment.

Study of the nonleptonic decay $\Xi^0_c \to \Lambda^+_c \pi^-$ in the covariant confined quark model