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p Polarization and 'Model Independent' Extraction of |Vub|/|Vcd| from D --> plv and B --> plvWe briefly discuss the predictions of the heavy quark effective theory for the semileptonic decays of a heavy pseudoscalar to a light one, or to a light vector meson. We point out that measurement of combinations of differential helicity decay rates at Cleo-c and the B factories can provide a model independent means of extracting the ratio |Vub|/|Vcd|. We briefly discuss the corrections to this prediction. Authors: Winston Roberts
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