Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin Effects in Neutralino Production in $e^+e^-$ Annihilation with
  polarized beams   We study the process e^+ e^- -> chi^0_1 chi^0_2 and the subsequent decay
chi^0_2 -> chi^0_1 l^{+} l^{-}$ with polarized beams, including the complete
spin correlations of chi^0_2$. We present numerical results for the lepton
energy and angular distributions, and for the distribution of the opening angle
between the leptons for sqrt{s}=500 GeV. The effects of spin correlations are
important in the lepton angular distribution, especially for gaugino-like
neutralinos. The opening angle distribution is particularly suitable for
distinguishing between higgsino- and gaugino-like neutralinos. The polarized
cross sections and lepton angular distributions are very sensitive to the
mixing of the neutralinos.

20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat