Intermediate psuedoscalar resonance contributions to B->Xs photon photon
Abstract
We calculate the decay rate B-> Xs photon photon via intermediate psuedoscalar charmonium etac. This process is thought to be the main long-distance contribution which dominates the corresponding inclusive rare B decay. We point out that once the momentum dependence of etac-> photon photon conversion strength, due to off-shellness of the intermediate etac, is taken into account, the rate of this decay mode is reduced. The change in differential decay rate in region of spectrum immediately below metac is more significant. On the other hand, we point out that the unexpectedly large branching ratio for B-> Xs eta' which is recently observed by CLEO could indicate a potentially larger long-distance contribution via eta' resonance.
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