Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phenomenology of next-leading BFKL   We propose a phenomenological study of the Balitsky-Fadin-Kuraev-Lipatov
(BFKL) approach applied to the data on the proton structure function $F_2$
measured at HERA in the small-$x_{Bj}$ region ($x_{Bj}<0.01$) and $Q^2$ in the
range 5 to 120 GeV$^2$. With a simplified ``effective kernel'' approximation,
we present a comparison between leading-logs (LO) and next-to-leading logs
(NLO) BFKL approaches in the saddle-point approximation, using known resummed
NLO-BFKL kernels. The LO result gives a very good description of the data with
a three parameters fit of $F_2$ but an unphysical value of the strong coupling
constant, whereas the NLO two parameters fit leads to a qualitatively
satisfactory account of the running coupling constant effect but
quantitatively, for $Q^2 < 10$ GeV$^2$, it fails to reproduce properly the
data.

1
The categories of this paper are: cs
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc