Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low Q^2 Structure Function Measurements   New Results on the measurement of the proton structure function F_2(x,Q^2)
are reported for momentum transfers squared Q^2 >= 1.5 GeV^2 and Bjorken x >=
3.5 10^{-5} using data collected by the HERA experiments H1 and ZEUS in 1994.
F_2 increases significantly with decreasing x, even in the lowest reachable Q^2
region. The data are well described by a Next to Leading Order QCD fit, and
support within the present precision that the rise at low x within this Q^2
range is generated via the DGLAP evolution equations. A comparison with models
based on pomeron exchange is also presented. The gluon density is extracted and
observed to rise at low x.

13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin