Estimate of the long-distance contribution through b --> s ψto the Bs --> γγdecay rate
G. Hiller, E. O. Iltan
Abstract
The Bs --> ϕψdecay is modeled through the inclusive b --> sψdecay. Using the Vector Meson Dominance model, the amplitude for the chain process Bs --> ϕψ--> ϕγ--> γγis estimated and it is found to be at most 4 % of the corresponding amplitude from the O7 type LD contribution. The intermediate amplitude for the process Bs --> ϕγis compared with the corresponding one obtained by a different approach based on the interaction of the virtual charm quark loop with soft gluons Ruckl. Both amplitudes are found to agree within 10 %. Further the influence on the branching ratio B(Bs --> γγ)SD+LDO7 from inclusive b --> s ψis estimated as less than 1 %.
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