Subleading shape-function effects and the extraction of |Vub|

Abstract

We derive a class of formulae relating moments of B-->Xu[script-l][overline nu ] to B-->Xsgamma in the shape-function region, where mX^2~mbLambdaQCD. We also derive an analogous class of formulae involving the decay B-->Xs[script-l]+[script-l]-. These results incorporate LambdaQCD/mb power corrections, but are independent of leading and subleading hadronic shape functions. Consequently, they enable one to determine |Vub|/|VtbVts*| to subleading order in a model-independent way.

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