Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Heavy Flavour Production at the electron-proton collider HERA   An overview over the recent heavy flavour results of the H1 and ZEUS
collaborations is presented. Various techniques to tag the heavy quark, which
allow to explore different phase space regions, are employed. Predictions of
pertubative QCD are compared to the charm and beauty production data. Charm and
beauty fractions of the proton structure function $F_2$ are

3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph