Nonleptonic charmed-meson decays

In this paper we compute and interrelate various nonleptonic charmed-meson decay matrix elements. With the assumption that the decay Hamiltonian is in the ΔI=1 form, numerous decay rates are interrelated. The predictions are compared to the experiment whenever sufficient data is available. In other cases we compare our results to those of the statistical model of Quigg and Rosner. To estimate the value of the D→K̄ππ decay amplitudes we make use of PCAC (partial conservation of axial-vector current) and we attribute the enhancement of these amplitudes relative to D→K̄π amplitudes to the final-state interactions. We suggest an approximate treatment of the problem and show that even though the parameter dependence is unavoidable it is possible to obtain the desired enhancement. Some numerical and graphical results are presented.