Nonfactorizable contributions to the decay mode D-0 -> K-0(K)over-bar(0) -art. no. 034010

We point out that the decay mode D-o-->K-o(K) over bar (o) has no factoriza ble contribution. In chiral perturbation language, treating D-o as heavy, t he O(p) contribution is zero. We calculate the nonfactorizable chiral loop contributions of order O(p(3)). Then, we use a heavy-light type chiral quar k model to calculate nonfactorizable tree level terms, also of order O(p(3) ), proportional to the gluon condensate. A priori, chiral loops are not exp ected to give good precision because the energy release in this decay is al most 800 MeV. Still, we find that both the chiral loops and the gluon conde nsate contributions are of the same order of magnitude as the experimental amplitude.