Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrared behaviour of propagators and running coupling in the conformal
  window of QCD   Using the Dyson-Schwinger approach we investigate Landau gauge QCD with a
relatively large number of chiral quark flavours. A self-consistent treatment
on the propagator level enables us to study unquenching effects via the quark
loop diagram in the gluon equation. Above the critical number of fermion
flavours the non-perturbative running coupling develops a plateau over a wide
momentum range. Correspondingly, the propagators follow a power law behaviour
in this momentum range indicating conformal behaviour. Our value
$N_f^{crit}=4.5$ is strongly sensitive to the details of the quark-gluon vertex
calling for more detailed investigations in future studies.

22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol