Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New effects observed in central production by the WA102 experiment at
  the CERN Omega Spectrometer   A study of central meson production as a function of the difference in
transverse momentum (dPT) of the exchanged particles shows that undisputed
qqbar mesons are suppressed at small dPT whereas the glueball candidates are
enhanced. In addition, the production cross section for different resonances
depends strongly on the azimuthal angle between the two outgoing protons.

20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
21
The categories of this paper are: adap-org