Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for neutralino pair production at sqrt(s) = 189 GeV   A search for pair-production of neutralinos at a LEP centre-of-mass energy of
189 GeV gave no evidence for a signal. This limits the neutralino production
cross-section and excludes regions in the parameter space of the Minimal
Supersymmetric Standard Model (MSSM).

35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin