Abstract
We calculate the leading-twist \( O\left( {\alpha_s^2\beta 0} \right) \) corrections to the B → π transition form factor f +(0) in light-cone sum rules. We find that, as expected, there is a cancellation between the \( O\left( {\alpha_s^2\beta 0} \right) \) corrections to f B f +(0) and the large corresponding corrections to f B , calculated in QCD sum rules. This suggests the insensitivity of the form factors calculated in the light-cone sum rules approach to this source of radiative corrections. We further obtain an improved determination of the CKM matrix element |Vub|, using latest results from BaBar and Belle for f +(0)|V ub|.
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Bharucha, A. Two-loop corrections to the B → π form factor from QCD sum rules on the light-cone and |Vub|. J. High Energ. Phys. 2012, 92 (2012). https://doi.org/10.1007/JHEP05(2012)092
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DOI: https://doi.org/10.1007/JHEP05(2012)092