Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A dynamical gluon mass solution in a coupled system of the
  Schwinger-Dyson equations   We study numerically the Schwinger-Dyson equations for the coupled system of
gluon and ghost propagators in the Landau gauge and in the case of pure gauge
QCD. We show that a dynamical mass for the gluon propagator arises as a
solution while the ghost propagator develops an enhanced behavior in the
infrared regime of QCD. Simple analytical expressions are proposed for the
propagators, and the mass dependency on the $\Lambda_{QCD}$ scale and its
perturbative scaling are studied. We discuss the implications of our results
for the infrared behavior of the coupling constant, which, according to fits
for the propagators infrared behavior, seems to indicate that $\alpha_s (q^2)
\to 0$ as $q^2 \to 0$.

16
The categories of this paper are: stat
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom