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Hi, as Marco pointed out in his AWG meeting talk: The processes he used (B->DKK) to tune ssbar-popping in JETSET are not really the ones one would like to use since the creation of the ssbar pair appears in the emitted W. There is some interesting analysis in this respect presented by Heiko Jasper (his diploma thesis): Please see his contribution in: http://babar-hn.slac.stanford.edu:5090/HyperNews/get/semi_lept_decays/174.html He studies the decay B->Ds K l nu. In this case, the ssbar popping appears topologically where it is of our interest. The analysis needs still to be reviewed. Nevertheless, we could at least have an idea of the order of magnitude of what the BF may be. (So far, only an upper limit is quoted by Heiko Jasper: 9*10^-4) Cheers, Heiko