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We construct the higher twist structure functions that describe inclusive bhadron decays in regions of phase space where the hadronic decay products carryhigh energy but have low invariant mass. We show that, for B meson decays,there are four new non-vanishing matrix elements of non-local operators. Weshow that to subleading twist these decays are parametrized in terms of fourfunctions. We compute the tree-level matching for a general heavy-to-lightcurrent and apply it to B -> X_s gamma. Using a simple model for thesefunctions we estimate the subleading twist contributions to this decay.Comment: 17 pages, 3 figures, revte

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

Light-cone distribution functions for<i>B</i>decays at subleading order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mi>m</mml:mi></mml:mrow><mml:mrow><mml:mi>b</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Light-cone distribution functions forBdecays at subleading order in1/mb