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

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

1999-05-10

arxiv.org/abs/hep-ph/9905277v1

Phys.Rev. D60 (1999) 117506

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages

Scientific paper

10.1103/PhysRevD.60.117506

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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