Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parity anomaly in Dirac equation in (1+2) dimensions, quantum
  electrodynamics and pair production   It is shown that parity operator plays an interesting role in Dirac equation
in (1+2) dimensions and can be used for defining chiral currents. It is shown
that the "anomalous" current induced by an external gauge field can be related
to the anomalous divergence of an axial vector current which arises due to
quantum radiative corrections provided by triangular loop Feynman diagrams in
analogy with the corresponding axial anomaly in (1+3) dimensions. It is shown
that the non-conservation of "chiral charge" due to anomaly is related with the
topological Chern-Simons charge. As an application pair creation of massless
fermions is discussed in electric field.

16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex