NONFACTORIZABLE LONG-DISTANCE CONTRIBUTIONS IN COLOR SUPPRESSED DECAYS OF B-MESONS

(B) over bar --> D pi, Dpi, J/psi (K) over bar and J/psi pi decays ar e studied. Their amplitude is given by a sum of factorized and nonfact orizable ones. The latter which is estimated by using a hard pion appr oximation is rather small in color favored (B) over bar --> D pi and D pi decays but still can efficiently interfere with the main amplitude given by the factorization. In the color suppressed (B) over bar --> J/psi (K) over bar and J/psi pi decays, the nonfactorizable contributi on is very important. The sum of the factorized and nonfactorizable am plitudes can reproduce well the existing experimental data on the bran ching ratios for the color favored (B) over bar --> D pi and Dpi and the color suppressed (B) over bar --> J/psi (K) over bar and J/psi pi decays by taking reasonable values of unknown parameters involved.