Factorization for power corrections to image and image Original Research Article

We derive factorization theorems for image power corrections to inclusive B-decays in the endpoint region, where image. In image our results are for the full triply differential rate. A complete enumeration of image corrections is given. We point out the presence of new image-suppressed shape functions, which arise at tree level with a 4π-enhanced coefficient, and show that these previously neglected terms induce an additional significant uncertainty for current inclusive methods of measuring image that depend on the endpoint region of phase space.