Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Perturbative QCD Correction to the $B\to\pi$ Transition Form Factor   We report on the perturbative $O(\alpha_s)$ correction to the light-cone QCD
sum rule for the $B\to \pi$ transition form factor $f^+$. The correction to the
product $f_Bf^+$ in leading twist approximation is found to be about 30%, that
is similar in magnitude to the corresponding $O(\alpha_s)$ correction in the
two-point sum rule for $f_B$. The resulting cancellation of large QCD
corrections in $f^+$ eliminates one important uncertainty in the sum-rule
prediction for this form factor.

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The categories of this paper are: cs
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The categories of this paper are: quant-ph
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The categories of this paper are: eess
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The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
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The categories of this paper are: econ
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The categories of this paper are: physics
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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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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: funct-an
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The categories of this paper are: math