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Perturbative QCD correction to the B → π transition form factor |
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| Authors: | A. Khodjamirian, R. Rü ckl, S. Weinzierl,O. Yakovlev, |
| Affiliation: | a Institut für Theoretische Physik, Universität Würzburg, D-97074, Würzburg, Germany b Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, D-80805, München, Germany c Service de Physique Théorique, Centre d'Etudes de Saclay, F-91191, Gif-sur-Yvette Cedex, France |
| Abstract: | We report on the perturbative O(s) correction to the light-cone QCD sum rule for the B → π transition form factor f+. The correction to the product fBf+ in leading twist approximation is found to be about 30%, that is similar in magnitude to the corresponding O(s) correction in the two-point sum rule for fB. The resulting cancellation of large QCD corrections in f+ eliminates one important uncertainty in the sum-rule prediction for this form factor. |
| Keywords: | QCD sum rules Perturbative calculations Bottom meson |
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