Perturbative QCD Correction to the Light-Cone Sum Rule for the $B^*Bπ $ and $D^*Dπ$ Couplings

Details Perturbative QCD Correction to the Light-Cone Sum Rule for the $B^*Bπ $ and $D^*Dπ$ Couplings Perturbative QCD Correction to the Light-Cone Sum Rule for the $B^*Bπ $ and $D^*Dπ$ Couplings

1999-03-20

arxiv.org/abs/hep-ph/9903421v1

Phys.Lett. B457 (1999) 245-252

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 1 figure, Latex, epsfig

Scientific paper

10.1016/S0370-2693(99)00518-3

The $B^*B\pi$ and $D^*D\pi$ couplings have previously been derived from a QCD light-cone sum rule in leading order. Here, we describe the calculation of the $O(\alpha_s)$ correction to the twist 2 term of this sum rule. The result is used for a first next-to-leading order analysis. We obtain $g_{B^*B\pi}= 22\pm 7$ and $g_{D^*D\pi}=10.5\pm 3$, where the error indicates the remaining theoretical uncertainty.

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