Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Few-Nucleon Forces and Systems in Chiral Effective Field Theory   We outline the structure of the nuclear force in the framework of chiral
effective field theory of QCD and review recent applications to processes
involving few nucleons.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat