Weak Radiative B Decays

Details Weak Radiative B Decays Weak Radiative B Decays

2006-06-06

arxiv.org/abs/hep-ph/0606065v2

Phys.Rev.D74:054015,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

typos corrected, references added, to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.74.054015

We study the (tree-level) weak radiative decays of $B$ mesons. We present a numerical estimate for the inclusive $b \to X_c \gamma (\gamma)$ modes based on the free-quark decay. We then review what is known for the $B \to D^\star \gamma$ modes in the framework of heavy quark effective theory and chiral perturbation theory. Finally, we extend these ideas to the double radiative decay modes $B \to D \gamma \gamma$. We find that the $b \to X_c \gamma \gamma$ rate is about an order of magnitude larger than the corresponding $b \to X_s \gamma \gamma$ rate. We also find the branching ratio for the $B \to D \gamma \gamma$ mode with most favorable CKM angles at the few $\times10^{-8}$ level, comparable to predictions for $B \to K \gamma \gamma$.

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