Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Observation of $\overline{B} \to D^{(*)} \pi^+\pi^-
  \ell^-\overline{\nu}$ decays in $e^+e^-$ collisions at the $\Upsilon(4S)$
  resonance
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
20
The categories of this paper are: acc-phys