Abstract

Interest in semileptonic (s.l.) bottom meson decays in the last few years has focused on the lepton energy end point spectrum. Theoretical models were needed for the description of the endpoint spectrum in order to be able to experimentally extract values for the ratio of KM matrix elements |Vbu/Vbc|. As approximately 90% of the total s.l. decay rate of bottom mesons is into the exclusive modes D and D* it was quite natural to try and model the endpoint spectrum by exclusive contributions. This approach was pioneered by GILMAN, ISGUR and WISE (GIW) in [1].

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