Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: |V_{ub}| from the Spectrum of B->pi e nu   I discuss the results for $|V_{ub}|f_+(0)$ and $|V_{ub}|$ obtained from the
spectrum of $B\to\pi e \nu$ and the form factor $f_+(q^2)$ from QCD sum rules
on the light-cone and unquenched lattice calculations; the shape of $f_+(q^2)$
is fixed from experimental data.

15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas