Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structure Function F_1 singlet in Double-Logarithmic Approximation   We calculate the perturbative component of the DIS structure function F_1
singlet in the Double-Logarithmic Approximation (DLA) and account at the same
time for the running QCD coupling effects. By constructing and solving
evolution equations accounting for the both x- and Q^2- evolutions, we obtain
the explicit expression for F_1 and, applying the saddle-point method,
calculate its small-x asymptotics which proves to be of the Regge form with the
intercept = 1.066. Its large value compensates for the lack of the factor 1/x
in the DLA contributions. Such fast growth at small x proves that the DLA
expressions are quite important for description of all QCD processes involving
the vacuum (Pomeron) exchanges. We also obtain that the small-x asymptotics of
F_1 depend on a single variable Q^2/x^2 and show that the small-x asymptotics
reliably represent F_1 at x = 10^{-6} or less.

15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th