Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Branching ratio and direct CP-violating rate asymmetry of the rare
  decays $B \to K^\ast \gamma$ and $B \to \rho \gamma$   We calculate CP-violating rate asymmetries in the rare radiative decays
$B^\pm\rightarrow K^{\ast\pm} \gamma$ and $B^\pm\rightarrow \rho^\pm \gamma$.
They arise because of the interference between leading-order penguin amplitudes
and one-gluon corrections with absorptive phases, and provide unambiguous
evidence for direct CP violation. Complementing earlier studies, we also
investigate gluon exchange with the `spectator' quark. The bound state effects
in the exclusive matrix elements are taken into account by a covariant model,
which yields a branching ratio $BR(B\rightarrow K^\ast \gamma) = (4-5)\times
10^{-5}$ in good agreement with the observed value. The bound state effects
increase the CP asymmetry, which is of order $1 \%$ in the channel
$B\rightarrow K^\ast \gamma$ and $15 \%$ for $B \to \rho \gamma$.

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The categories of this paper are: nlin
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: gr-qc
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: cs
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: stat