Shape-function independent relations of charmless inclusive B-decay spectra
Abstract
A leading-power factorization formula for weight functions relating the B to Xs gamma photon spectrum to arbitrary partial decay rates in B to Xu l nu is derived. These weight functions are independent of the hadronic shape function and allow for the determination of Vub in a model-independent way. We calculate the weight function in renormalization-group improved perturbation theory to complete next-to-next-to leading order at the jet scale mui2 ~ mb LambdaQCD and to next-to leading order at the hard scale muh ~ mb. First-order power corrections are also included, where a model-dependence enters via the appearance of subleading hadronic shape functions.
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