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

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

2008-10-07

arxiv.org/abs/0810.1230v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 4 figures. Properly MSbar-renormalized coefficient functions introduced. Matches published version

Scientific paper

10.1016/j.nuclphysb.2008.11.019

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(alpha_s^2) determination of |V_ub| from
inclusive semi-leptonic \bar B --> X_u l nu decays in the shape-function
region.

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