Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of Scaling Violations in Scaled Momentum Distributions at
  HERA   Charged particle production has been measured in deep inelastic scattering
(DIS) events over a large range of $x$ and $Q^2$ using the ZEUS detector. The
evolution of the scaled momentum, $x_p$, with $Q^2,$ in the range 10 to 1280
$GeV^2$, has been investigated in the current fragmentation region of the Breit
frame. The results show clear evidence, in a single experiment, for scaling
violations in scaled momenta as a function of $Q^2$.

9
The categories of this paper are: nlin
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The categories of this paper are: eess
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci