Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scaling in $\gamma^* p$ total cross sections, saturation and the gluon
  density   Including the new HERA data, the $\gamma^* p$ total cross section is analysed
in the generalized vector dominance/colour-dipole picture (GVD/CDP) that
contains scaling in $\eta = (Q^2 + m^2_0) / \Lambda^2 (W^2)$, where $\Lambda^2
(W^2)$ is an increasing function of $W^2$.
  At any $Q^2$, for $W^2 \to \infty$, the cross sections for virtual and real
photons become identical, $\sigma_{\gamma^* p} (W^2, Q^2) / \sigma_{\gamma p}
(W^2) \to 1$. The gluon density deduced from the colour-dipole cross section
fulfills the leading order DGLAP relationship. Evolution \`a la DGLAP breaks
down for $\eta \lsim 0.1$.

7
The categories of this paper are: hep-th
12
The categories of this paper are: nucl-th
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
3
The categories of this paper are: physics