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Two-loop QCD correction to differential semi-leptonic b→u decays in the shape-function region

M. Beneke
T. Huber
Xin-Qiang Li
Journal / Anthology

Nuclear Physics B
Year: 2009
Volume: 811
Issue: 1-2
Page range: 77-97

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(α2 s ) determination of |Vub | from inclusive semi-leptonic B →Xuν decays in the shape-function region.