Speaker: Svjetlana FAJFER
Title
Nonfactorizable contributions to the decay mode $D^0 \to K^0 \bar K^0$
Abstract
We point out that the decay mode $D^0 \rightarrow K^0 \bar K^0$ has no factorizable contribution. In the chiral perturbation language, treating $D^0$ as heavy, the $O(p)$ contribution iz zero. We calculate the nonfactorizable chiral loop contributions of order $O(p^3)$. Then, we use a heavy-light type chiral quark model to calculate non-factorizable tree level terms, also of order $O(p^3)$, proportional to the gluon condensate. We find that both the chiral loops and the gluon condensate contributions are of the same order of magnitude as the experimental amplitude.