Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Non-coherent contributions in charge-exchange reactions and
  $\eta$--$\eta'$ mixing   We analyse $K^- p \to (\eta, \eta',\pi^0) \Lambda$ on the basis of the fit of
data in a wide region of energies, and $\pi^- p \to (\eta, \eta') n$ at the
energies of GAMS-4$\pi$. We show that disagreements between the data and the
predictions of Regge theory may be explained by the mode change of summation of
intermediate contributions at increasing energy, from coherent to non-coherent.
A method of experimental measurement of the non-coherent contributions is
proposed. On the basis of available data on the charge-exchange reactions the
$\eta$--$\eta'$ mixing is estimated.

2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph