Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: FCNC transition of $B$ to $a_1$ with LCSR   The $B\to a_1 \ell^+ \ell^-$ decays occur by the electroweak penguin and box
diagrams which can be performed through the flavor changing neutral current
(FCNC). We calculate the form factors of the FCNC $B \to a_1$ transitions in
the light--cone sum rules approach, up to twist--4 distribution amplitudes of
the axial vector meson $a_1$. Forward--backward asymmetry, as well as branching
ratios of $B\to a_1\ell^{+}\ell^{-}$, and $B\to a_1 \gamma$ decays are
considered. A comparison is also made between our results and the predictions
of other methods.

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The categories of this paper are: gr-qc
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: eess
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The categories of this paper are: cs
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin