arXiv:0810.1230·v2·High Energy Physics — Phenomenology
Two-loop QCD correction to differential semi-leptonic b --> u decays in the shape-function region
M. Beneke (RWTH Aachen University, University of Zurich)🇩🇪 · T. Huber (RWTH Aachen University)🇩🇪 · Xin-Qiang Li (RWTH Aachen University)🇩🇪
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(alpha_s^2) determination of |V_ub| from inclusive semi-leptonic \bar B --> X_u l nu decays in the shape-function region.
Comments: 24 pages, 4 figures. Properly MSbar-renormalized coefficient functions introduced. Matches published version