Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electromagnetic production of pions and quark dynamical mass in
  Minkowski space   Mechanism for generation of vector meson resonances is studied in the
framework of QCD Dyson-Schwinger equations, which are defined and actually
solved in Minkowski space. It is suggested that the timelike pion form factor
is generated by the interference of the background quark loops together with
the resonant structure predominantly created in the photon-quark-antiquark
vertex. It is suggested that QCD Green's functions involving quark fields are
oscillating for timelike arguments, which makes the interference effect among
various QCD Green's functions quite strong and important for the correct
description of production processes. A further peculiarities of dynamical
chiral symmetry breaking and confinement phenomena as viewed in Minkowski space
are discussed.

37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat