Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Gauge invariant composite operators of QED in the exact renormalization
  group formalism   Using the exact renormalization group (ERG) formalism, we study the gauge
invariant composite operators in QED. Gauge invariant composite operators are
introduced as infinitesimal changes of the gauge invariant Wilson action. We
examine the dependence on the gauge fixing parameter of both the Wilson action
and gauge invariant composite operators. After defining ``gauge fixing
parameter independence,'' we show that any gauge independent composite
operators can be made ``gauge fixing parameter independent'' by appropriate
normalization. As an application, we give a concise but careful proof of the
Adler-Bardeen non-renormalization theorem for the axial anomaly in an arbitrary
covariant gauge by extending the original proof by A. Zee.

1
The categories of this paper are: cs
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys