Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Aspects of QCD Factorization   The QCD factorization approach provides the theoretical basis for a
systematic analysis of nonleptonic decay amplitudes of B mesons in the
heavy-quark limit. After recalling the basic ideas underlying this formalism,
several tests of QCD factorization in the decays B -> D^(*) L, B -> K^* gamma,
and B -> pi K,pi pi are discussed. It is then illustrated how factorization can
be used to obtain new constraints on the parameters of the unitarity triangle.

2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg