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We point out that the decay mode D^0 -> K^0 \bar{K^0} has no factorizablecontribution. In the chiral perturbation language, treating D^0 as heavy, theO(p) contribution is zero. We calculate the nonfactorizable chiral loopcontributions of order O(p^3). Then, we use a heavy-light type chiral quarkmodel to calculate nonfactorizable tree level terms, also of order O(p^3),proportional to the gluon condensate. We find that both the chiral loops andthe gluon condensate contributions are of the same order of magnitude as theexperimental amplitude.Comment: 20 pages, 8 figure

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

Nonfactorizable contributions to the decay mode<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>K</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow…

Nonfactorizable contributions to the decay modeD0→K0K0