Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prospects for heavy flavour photoproduction at HERA   I discuss few selected topics in heavy flavour photoproduction at HERA which
require large integrated luminosity in order to be experimentally investigated.
I present phenomenological predictions for bottom production. As a possible
application of measurements involving double-tagged charm events, I outline a
method for the direct measurement of the gluon density in the proton. The
possibility of using charm data in polarized electron-proton collisions to
constrain the polarized gluon density in the proton is also discussed.

22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex