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arXiv · hep-ph/9905277

B -> K^* gamma from D -> K^* l nu

Zoltan Ligeti·Mark B. Wise
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Abstract

The B -> K^* gamma branching fraction is predicted using heavy quark spin symmetry at large recoil to relate the tensor and (axial-)vector form factors, using heavy quark flavor symmetry to relate the B decay form factors to the measured D -> K^* l nu form form factors, and extrapolating the semileptonic B decay form factors to large recoil assuming nearest pole dominance. This prediction agrees with data surprisingly well, and we comment on its implications for the extraction of |Vub| from B -> rho l nu.

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Zoltan Ligeti, Mark B. Wise. 1999-05-10. B -> K^* gamma from D -> K^* l nu. https://doi.org/10.1103/physrevd.60.117506

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