Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for Charginos and Neutralinos in e+e- collisions at \sqrt{s} =
  189 Gev   We report the result of a search for charginos and neutralinos, in e+e-
collisions at 189 GeV centre-of-mass energy at LEP. No evidence for such
particles is found in a data sample of 176 pb^{-1}. Improved upper limits for
these particles are set on the production cross sections. New exclusion
contours in the parameter space of the Minimal Supersymmetric Standard Model
are derived, as well as new lower limits on the masses of these supersymmetric
particles. Under the assumptions of common gaugino and scalar masses at the GUT
scale, we set an absolute lower limit on the mass of the lightest neutralino of
32.5 GeV and on the mass of the lightest chargino of 67.7 GeV.

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The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
1
The categories of this paper are: cs
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: cmp-lg