Abstract
In order to extract the Cabibbo-Kobayashi-Maskawa matrix element |V{sub ub}| from B{yields}X{sub u}l{nu}{sub l} decays, the overwhelming background from B{yields}X{sub c}l{nu}{sub l} decays must be reduced by appropriate acceptance cuts. We study the nonperturbative effects due to the motion of the b quark inside the B meson on the phenomenologically relevant decay distributions of B{yields}X{sub u}l{nu}{sub l} in the presence of such cuts in a comparative analysis based on shape functions and the parton model in the light cone limit. Comparisons with recent data from the CLEO, BABAR, and BELLE collaborations favor the shape-function approach.
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