Using a generalization of the $\left|\Delta I\right|=\frac{1}{2}$ rule, we analyze the nonleptonic weak decays of pseudoscalar charmed mesons. We call attention to the likelihood that the dominant decays will be into many-body channels. Special attention is devoted to the properties of charmed final states just above charm threshold in $e^{+}{e}^{-}$ annihilation. The questions of charged multiplicity, copious kaon production, and energy carried by neutrals are explored.

• Received 3 March 1975

DOI:https://doi.org/10.1103/PhysRevD.12.2015