ESTIMATE OF THE LONG-DISTANCE CONTRIBUTION THROUGH B-]S-PSI TO THE B-S-]GAMMA-GAMMA DECAY-RATE

The B-s --> phi psi decay is modeled through the inclusive b --> s phi decay. Using the vector meson dominance model, the amplitude for the chain process B-s --> phi psi --> phi gamma --> gamma gamma is estimat ed and it is found to be at most 4% of the corresponding amplitude fro m the O-7 type LD contribution. The intermediate amplitude for the pro cess B-s --> phi gamma is compared with the corresponding one obtained by a different approach based on the interaction of the virtual charm quark loop with soft, gluons.(7) Both amplitudes are found to agree w ithin 10%. Further the influence on the branching ratio B(B-s --> gamm a gamma)(SD+LDO7) from inclusive b --> s psi is estimated to be less t han 1%.