Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study on pure annihilation type B to V gamma decays   We investigate the pure annihilation type radiative $B$ meson decays $B^0 \to
\phi \gamma$ and $B_s \to \rho^0(\omega)\gamma$ in the soft-collinear effective
theory. We consider three types of contributions to the decay amplitudes,
including the direct annihilation topology, the contribution from the
electro-magnetic penguin operator and the contribution of the neutral vector
meson mixings. The numerical analysis shows that the decay amplitudes are
dominated by the $\omega-\phi$ mixing effect in the $B^0 \to \phi\gamma$ and
$B_s \to \omega\gamma$ modes. The corresponding decay branching ratios are
enhanced about three orders of magnitudes relative to the pure annihilation
type contribution in these two decay channels. The decay rate of $B_s \to
\rho^0\gamma$ is much smaller than that of $B_s \to \omega\gamma$ because of
the smaller $\rho^0-\phi$ mixing. The predicted branching ratios
$B(B^{0}\rightarrow\phi\gamma)=(3.99^{+1.67}_{-1.46}
)\times10^{-9},\,B(B_s\rightarrow\omega\gamma)=(2.01^{+0.81}_{-0.71}
)\times10^{-7}$ are to be tested by the Belle-II and LHC-b experiments.

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The categories of this paper are: quant-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: physics
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: q-bio