Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Recent developments in heavy baryon chiral perturbation theory: Selected
  topics   I review recent results in baryon chiral perturbation theory, in particular
related to pion-nucleon scattering and first systematic attempts to go beyond
next-to-leading order in the case of three flavors. New insight into the chiral
expansion of the baryon masses and magnetic moments is presented.

22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess