Internal W-emmission and W-exchange Contributions to {\bf B}\to {{\bf D}^{(*)} Decays

Details Internal W-emmission and W-exchange Contributions to {\bf B}\to {{\bf D}^{(*)} Decays Internal W-emmission and W-exchange Contributions to {\bf B}\to {{\bf D}^{(*)} Decays

1996-03-08

arxiv.org/abs/hep-ph/9603250v1

Phys.Rev. D55 (1997) 237-243

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, Latex, 1 Postscript file

Scientific paper

10.1103/PhysRevD.55.237

We evaluate external $W$-emission, internal $W$-emission and $W$-exchange contributions to nonleptonic $B\to D^{(*)}$ decays based on the perturbative QCD formalism including Sudakov effects, whose ratio is found to be $1:+0.2:0.03i$ at the amplitude level. We observe that the internal $W$-emission contribution is additive to the external $W$-emission contribution, and that the $W$-exchange contribution is negligible and mainly imaginary, its real part being at least one order of magnitude smaller than the imaginary part. Our predictions are consistent with the CLEO data and with those obtained by the Bauer-Stech-Wirbel method.

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