Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Physical Anomalous Dimensions at Small $x$   I present a theoretical discussion of the uncertainties related to the QCD
analysis of the proton structure function $F_2(x,Q^2)$ at small $x$. The role
played by the `unphysical' gluon density is pointed out. It is shown how the
study of more observables can reduce the theoretical uncertainty and, in
particular, an alternative method of analysis, based on the introduction of
physical anomalous dimensions, is suggested.

7
The categories of this paper are: hep-th
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The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics