Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Topology in QCD with 4 flavours of dynamical fermions   We study the topological properties of full QCD with four flavours of
dynamical staggered fermions. In particular the topological susceptibility is
measured and the problem of the determination of its first derivative is
discussed.

25
The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
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The categories of this paper are: q-fin
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The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio