Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Comment on Heavy Quark Effective Fields   Effective fields defined in the heavy-quark effective theory to describe
heavy quarks in heavy-light hadrons are examined in some detail in the standard
formulation of a quantum field theory.

8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
1
The categories of this paper are: cs
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat