Hadronic weak decays of Λ c in the quark model

The hadronic weak decays of ${\mathrm{\ensuremath{\Lambda}}}_{c}$ are studied in the framework of a constituent quark model. With the combined analysis of the Cabbibo-favored processes, ${\mathrm{\ensuremath{\Lambda}}}_{c}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Lambda}}{\ensuremath{\pi}}^{+}$, ${\mathrm{\ensuremath{\Sigma}}}^{0}{\ensuremath{\pi}}^{+}$, and ${\mathrm{\ensuremath{\Sigma}}}^{+}{\ensuremath{\pi}}^{0}$, we confirm that the nonfactorizable transition mechanisms play a crucial role in the understanding of their compatible branching ratios. We emphasize that the SU(3) flavor symmetry breaking effects, which is generally at the order of 1--2%, can be amplified by the destructive interferences among the pole terms in the diagrams with internal conversion. Some contributions are sensitive to the spatial distribution of the scalar-isoscalar light-quark sector in the ${\mathrm{\ensuremath{\Lambda}}}_{c}$, and its overlap with the light quarks in the final state hyperon. Namely, a compact diquark configuration is disfavored.