Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Searches for Exotics at HERA   Searches for contact interactions, leptoquark bosons and excited fermions
carried out at the HERA ep collider are presented here. The searches are based
on ~ 40 pb^-1 of e+ p data per experiment collected at a centre of mass energy
~ 300 GeV. First results on e- p data collected in 1998-1999 are also
presented.

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The categories of this paper are: q-alg
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The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys