Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Glueball Filter in Central Production and Broken Scale Invariance   We propose a possible explanation of the kinematical dependence of the
central production of the scalar glueball candidate observed recently by the
WA91 and WA102 Collaborations, and discussed by Close and Kirk, in the context
of the broken scale invariance of QCD. The dependences of glueball production
on the transverse momenta and azimuthal angles of the final-state protons may
be related to the structure of the trace anomaly in QCD.

18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an