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We briefly discuss the predictions of the heavy quark effective theory forthe semileptonic decays of a heavy pseudoscalar to a light one, or to a lightvector meson. We point out that measurement of combinations of differentialhelicity decay rates at Cleo-c and the $B$ factories can provide a modelindependent means of extracting the ratio  $|V_{ub}|/|V_{cd}|$. We briefly discuss the corrections to this prediction.Comment: 8 pages, LaTeX, 1 figur

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi></mml:math>polarization and model independent extraction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>|</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mrow><mml:mi>ub</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mi>|</mml:mi><mml:mo>/</mml:mo><mml:mi>|</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi>V</mml:mi></mml:mrow><mml:mrow><mml:mi>cd</…

ρpolarization and model independent extraction of|Vub|/|Vcd