Two-loop QCD correction to differential semi-leptonic b --> u decays in the shape-function region
Abstract
We calculate the two-loop QCD correction to the form factors of on-shell b-quark decay to an energetic massless quark, which constitutes the last missing piece required for an O(alphas2) determination of |Vub| from inclusive semi-leptonic B --> Xu l nu decays in the shape-function region.
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