Power corrections to B Xu l (Xsγ) decay spectra in the "shape-function" region
Abstract
Using soft-collinear effective theory (SCET), we examine the 1/mb corrections to the factorization formulas for inclusive semi-leptonic B decays in the endpoint region, where the hadronic final state consists of a single jet. At tree level, we find a new contribution from four-quark operators that was previously assumed absent. Beyond tree level many sub-leading shape-functions are needed to correctly describe the decay process.
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