Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the eta-eta' system in the two mixing angle scheme   An analysis of various decay processes is performed using the two mixing
angle description of the $\eta$-$\eta^\prime$ system, incorporating the link to
the gluonic sector through anomalies. The agreement is excellent. For
comparison with previous works, our results are expressed both in the
``octet-singlet'' and in the ``quark-flavour'' basis. It turns out that at the
present experimental accuracy, the two angles are significantly different in
the former, but not in the latter basis. The implications of our analysis for
the Large $N_c$ $\chi$PT predictions are also discussed.

17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an