Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Improved actions of the staggered fermion   We have studied $O(a^2)$ improved lattice QCD with the staggered fermion by
using Symanzik's program. We find that there are 5 dimension-6 fermion
bilinears and gauge operators. In addition, there are 10 four-fermion operators
which are absent at the tree-level and tadpole-improved tree-level.

34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg