Perturbative QCD Correction to the $B\toπ$ Transition Form Factor

Details Perturbative QCD Correction to the $B\toπ$ Transition Form Factor Perturbative QCD Correction to the $B\toπ$ Transition Form Factor

1997-06-09

arxiv.org/abs/hep-ph/9706303v1

Phys.Lett. B410 (1997) 275-284

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 4 figures, Latex, epsfig

Scientific paper

10.1016/S0370-2693(97)00936-2

We report on the perturbative $O(\alpha_s)$ correction to the light-cone QCD sum rule for the $B\to \pi$ transition form factor $f^+$. The correction to the product $f_Bf^+$ in leading twist approximation is found to be about 30%, that is similar in magnitude to the corresponding $O(\alpha_s)$ correction in the two-point sum rule for $f_B$. The resulting cancellation of large QCD corrections in $f^+$ eliminates one important uncertainty in the sum-rule prediction for this form factor.

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