Abstract
Heavy-quark (mQ→∞) flavour symmetry can be used together with the light-quarkSU(3) flavour symmetry to relate the semi-leptonic decays B → ρl⥉l and D → K*lνl. We use recent data on the semi-leptonic D decays to make predictions on the B→ϱ transition. We also compare these predictions with other theoretical approaches and we show that, in order to discriminate among the different models, a measurement of the ϱ polarization would be useful. Heavyflavour symmetry can also be used to relate the decay processes D → K*lνl and B→K*γ, in the limitmQ→∞. We compare these predictions with the CLEO II data and we argue that a satisfactory agreement is found only if a consistent treatment of theO(1/mQ) corrections is performed.
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