Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strangeness Production at the HERA-B Experiment   HERA-B is a fixed target experiment at the 920 GeV HERA proton beam at DESY
which uses a variety of nuclear targets. During the last data taking period
from Nov. 2002 to Feb. 2003, 200 million minimum bias events were recorded.
  A large sample of V^0(K_zero, Lambda_zero, Lambda_zero_bar), approximately
20000 cascade hyperons Xi^(-/+) and 1200 Omega^(-/+) over low background were
reconstructed using these data. About 1 million K^*(892) --> K pi and 60,000
phi(1020) --> K^+K^- decays in central production $(-0.15 < x_F < 0.1, 0.5 <
p_t^2 < 12.1 (GeV/c)^2 were analyzed.
  Preliminary results for differential p_t^2 spectra, atomic numeber dependence
and anti-particle to particle ratios are presented.

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The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph