Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy-Meson Decay Constants: Isospin Breaking from QCD Sum Rules   Compared with lattice QCD, isospin breaking of heavy-meson decay constants
from QCD sum rules agrees for $D$ mesons but disagrees (by a factor of four)
for $B$ mesons.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
2
The categories of this paper are: math