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The differential decay spectrum $d\Gamma/dE_e dq^2$ for the semileptonicdecay of an unpolarized hadron containing a b-quark, and the decay spectrum$d\Gamma/dE_e dq^2 d\!\cos\theta$ for polarized $\Lambda_b$ decay are computedto second order in the $1/m_b$ expansion. Most of the $1/m_b^2$ correctionshave a simple physical interpretation, which is discussed in detail. Theimplications of the results for the determination of $V_{ub}$ are discussed.The decay spectra for semileptonic decay of hadrons containing a c-quark arealso given. There is a subtlety in the use of the equations of motion at order$1/m_b^2$ in the heavy quark expansion which is explained.Comment: (46 pages, 8 figs, uses harvmac and uufiles), UCSD/PTH 93-14,  CALT-68-1883 (REVISED VERSION: Some typos corrected, and one incorrect  paragraph deleted

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

Inclusive semileptonic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>B</mml:mi></mml:math>and polarized<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>decays from QCD

Inclusive semileptonicBand polarizedΛbdecays from QCD