B^+ --> D^{*+}_s gamma and B^+ --> D^{*+} gamma as Probes of V_{ub}

Details B^+ --> D^{*+}_s gamma and B^+ --> D^{*+} gamma as Probes of V_{ub} B^+ --> D^{*+}_s gamma and B^+ --> D^{*+} gamma as Probes of V_{ub}

1999-02-16

arxiv.org/abs/hep-ph/9902369v2

Phys.Rev.D60:031302,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, latex (revtex), 2 eps figures. Corrects numerical errors in branching fraction calculation

Scientific paper

10.1103/PhysRevD.60.031302

The decays B^+ --> D^{*+}_s gamma and B^+ --> D^{*+} gamma can be used for an extraction of |V_{ub}|. When the b and c quarks are nearly degenerate the rate for these modes can be determined in terms of other observed rates, namely B\bar{B} mixing and D^* --> D gamma decay. To this end we introduce a novel application of heavy quark and flavor symmetries. Although somewhat unrealistic, this limit provides us with a first estimate of these rates.

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