Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $B$-Meson Distribution Amplitude from the $B\to \pi$ Form Factor   Employing the light-cone sum rule approach in QCD, we relate the $B$-meson
distribution amplitude to the $B\to \pi$ form factor at zero momentum transfer.
In leading order, the sum rule is converted into a simple expression for the
inverse moment $\lambda_B$ of the distribution amplitude $\phi_{+}^B$. Using as
an input the $B\to\pi$ form factor calculated from the light-cone sum rule in
terms of pion distribution amplitudes, we obtain an estimate: $\lambda_B =460
\pm 160 $ MeV. We investigate how this result is modified by the $B$-meson
three-particle distribution amplitudes.

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The categories of this paper are: astro-ph
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The categories of this paper are: supr-con
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: econ
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The categories of this paper are: math
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The categories of this paper are: comp-gas