Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of charm fragmentation fractions in photoproduction at HERA   The production of D^0, D^*+, D^+, D_s+ and Lambda_c^+ charm hadrons and their
antiparticles in ep scattering at HERA has been studied with the ZEUS detector,
using a total integrated luminosity of 372 pb^-1. The fractions of charm quarks
hadronising into a particular charm hadron were derived. In addition, the ratio
of neutral to charged D-meson production rates, the fraction of charged D
mesons produced in a vector state, and the stangeness-suppression factor have
been determined. The measurements have been performed in the photoproduction
regime. The charm hadrons were reconstructed in the range of transverse
momentum p_T >3.8 GeV and pseudorapidity |eta|<1.6. The charm fragmentation
fractions are compared to previous results from HERA and from e+e-experiments.
The data support the hypothesis that fragmentation is independent of the
production process.

31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph