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We study the O(Lambda/mb) corrections to the singly and doubly differentialhadronic invariant mass spectra d\Gamma/dsH and d\Gamma/dsH dq^2 in b -> udecays, and discuss the implications for the extraction of the CKM matrixelement |Vub|. Using simple models for the subleading shape functions, theeffects of subleading operators are estimated to be at thefew percent level forexperimentally relevant cuts. The subleading corrections proportional to theleading shape function are larger, but largely cancel in the relation betweenthe hadronic invariant mass spectrum and the photon spectrum in B -> X_s\gamma. We also discuss the applicability of the usual prescription ofconvoluting the partonic level rate with the leading light-cone wavefunction ofthe b quark to subleading order.Comment: 26 pages, 7 figure

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

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