Du, DS (reprint author), Acad Sinica, Inst High Energy Phys, POB 918 4, Beijing 100039, Peoples R China.
We discuss the nonfactorization effects in B --> J/Psi X-s, which is similar to the nonperturbative effect found by Voloshin in the decay B --> gamma + X-s. The QCD sum rule has been used to estimate the hadron matrix elements. We find that the correction from this effect is very large and the large discrepancy between the theory and the experimental data can be reduced considerably. (C) 1997 Elsevier-Science B.V.