Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: B-meson distribution amplitudes   B-meson light-cone distribution amplitudes are discussed in these lectures in
the framework of HQET. The evolution equation for the leading-twist
distribution amplitude is derived in one-loop approximation. QCD sum rules for
distribution amplitudes are discussed.

23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph