Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-nucleon problem in semi-relativistic baryon chiral perturbation
  theory   We consider a symmetry-preserving approach to the nucleon-nucleon scattering
problem in the framework of the higher-derivative formulation of baryon chiral
perturbation theory. Within this framework the leading-order amplitude is
calculated by solving renormalizable equations and corrections are taken into
account perturbatively.

24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
0
The categories of this paper are: hep-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci