INTERMEDIATE PSEUDOSCALAR RESONANCE CONTRIBUTIONS TO B-]X-S-GAMMA-GAMMA

We calculate the decay rate Gamma(B-->X-s gamma gamma) via intermediat e pseudoscalar charmonium eta(c). This process is thought to be the ma in long-distance contribution which dominates the corresponding inclus ive rare B decay. We point out that once the momentum dependence of th e eta(c)-->gamma gamma conversion strength, due to the off-shellness o f the intermediate eta(c), is taken into account, the rate of this dec ay mode is reduced. The change in differential decay rate in the regio n of the spectrum immediately below m(eta c) is more significant. On t he other hand, we point out that the unexpectedly large branching rati o for B-->X-s eta' which was recently observed by CLEO could indicate a potentially larger long-distance contribution via eta' resonance.