Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Weak Radiative B Decays   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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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an