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B^+ --> D^(*+)_s gamma and B^+ --> D^(*+) gamma as Probes of V_(ub)

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arxiv hep-ph/9902369 v2 pith:3RM2BLRH submitted 1999-02-16 hep-ph

B^+ --> D^(*+)_s gamma and B^+ --> D^(*+) gamma as Probes of V_(ub)

classification hep-ph
keywords gammaratesalthoughapplicationdecaydecaysdegeneratedetermined
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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