Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Small $x$ and Small $Q^2$   I discuss (i) hadron-hadron and photon-hadron total cross-sections, (ii)
elastic scattering, (iii) the r\^{o}le of minijets in total cross-sections and
the need to include them in Monte-Carlos for small-$x$ structure functions,
(iv) how the two pomerons affect small-$x$ behaviour, and (v) rapidity-gap
physics.

22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat