Nonfactorizable contributions to the decay mode D^0 -> K^0 \bar{K^0}

Abstract

We point out that the decay mode D^0 -> K^0 \bar{K^0} has no factorizable contribution. In the chiral perturbation language, treating D^0 as heavy, the 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 quark model to calculate nonfactorizable 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.

20 pages, 8 figures

References in corpus (1)

• Search for CP Violation in $D^0\to K_S^0{\pi }^0$, $D^0\to {\pi }^0{\pi }^0$ and $D^0\to K_S^0{K}_S^0$

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