Instruct: Identify the main and secondary category of Arxiv papers based on the titles
Query: Determining the $\eta-\eta'$ mixing by the newly measured
  $BR(D(D_s)\to\eta(\eta')+\bar l+\nu_l$
3
The categories of this paper are: physics
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph