Abstract
It has been recently argued that some longstanding problems in semileptonic $B$ decays can be solved provided the branching ratio for the $B\ensuremath{\rightarrow}{D}^{\ensuremath{'}(*)}$ semileptonic decays are large enough. We have studied these decays in a constituent quark model, which has been successful in describing semileptonic and nonleptonic $B$ decays into orbitally excited charmed mesons. Our results do not confirm the hypothesis of large branching ratios for the $B\ensuremath{\rightarrow}{D}^{\ensuremath{'}(*)}$ semileptonic decays. In addition, we calculate the nonleptonic $B\ensuremath{\rightarrow}{D}^{\ensuremath{'}}\ensuremath{\pi}$ decays which can provide an independent test of the form factors involved in the $B\ensuremath{\rightarrow}{D}^{\ensuremath{'}(*)}$ reactions.
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