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We study the distribution function of the b-quark for inclusive semileptonicB decays in the framework of the parton model. We compare the functionalbehavior of the fragmentation inspired function and the Gaussian ACCMMfunction, and discuss their validity. Using the HQET parameters, we cancritically test these models.Comment: 24 pages, ReVTex with 6 eps figure files embedded with epsfig.sty the  1st revised version, to appear in Phys. Rev.

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

Motion of a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>b</mml:mi></mml:math>quark inside a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>meson: The parton model versus the Altarelli-Cabibbo-Corbo-Maiani-Martinelli model

Motion of abquark inside aBmeson: The parton model versus the Altarelli-Cabibbo-Corbo-Maiani-Martinelli model