Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Description of the Proton Structure Function $F_2^p(x,Q^2)$ in the
  Framework of Extended Regge - Eikonal Approach   The proton structure function $F_2^p(x,Q^2)$ is described in the framework of
the off-shell extention of the Regge-eikonal approach which automatically takes
into account off-shell unitarity. We achieved a good quality of description for
$x<10^{-2}$ and we argue that the data on $F_2^p(x,Q^2)$ measured at HERA can
be fairly described with classical universal Regge trajectories. No extra,
``hard'' trajectories of high intercept are needed for that. The $x-, Q^2-$
slopes and the effective intercept are discussed as functions of $Q^2$ and $x$.

20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
19
The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th