Quark-diagram analysis of charmed-baryon decays

The Cabibbo-allowed two-body nonleptonic decays of charmed baryons to a SU(3)-octet (or -decuplet) baryon and a pseudoscalar meson are examined on the basis of the quark-diagram scheme. Some relations among the decay amplitudes or rates of various decay modes are derived. The decays of ${\Xi }_c^{+}$ to a decuplet baryon are forbidden.