Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A possible gateway to eta_b: chi_{b0}(2P) -> eta eta_b   It is argued that the branching ratio for the decay chi_{b0}(2P) -> eta eta_b
can reach few permil as a result of the enhancement of the eta emission by the
axial anomaly in QCD. This might make the discussed process practical for an
experimental search for the eta_b.

26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
1
The categories of this paper are: cs
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th