Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Semileptonic B -> a_1 l nu decay in QCD   The form factors and the branching ratio of the "B -> a_1 l nu" decay are
calculated in framework of QCD sum rules. A comparison of our results on form
factors and branching ratio with the results from constituent quark model is
presented.

26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat