Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fundamental properties of resonances   All resonances, from hydrogen nuclei excited by the high-energy gamma rays in
deep space to newly discovered particles produced in Large Hadron Collider,
should be described by the same fundamental physical quantities. However, two
distinct sets of properties are used to describe resonances: the pole
parameters (complex pole position and residue) and the Breit-Wigner parameters
(mass, width, and branching fractions). There is an ongoing decades-old debate
on which of them should be abandoned. In this study of nucleon resonances
emerging in the elastic pion-nucleon scattering we discover an intricate
interplay of the parameters from both sets, and realize that neither set is
completely independent or fundamental on its own.

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The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex