Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Quasi-two-body decays $B \to \eta_c {(1S
  ,2S)}\;[\rho(770),\rho(1450),\rho(1700) \to ]\; \pi\pi$ in the perturbative
  QCD approach
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin