Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: N and Delta Resonances in the Rigid Quark-Diquark Vibrator   A nearest-neighbor analysis of light flavor baryon mass spectra reveals
striking degeneracy patterns- narrow mass bands populated by series of parity
twins of steadily increasing spins. Each series terminates by an unpaired
resonance of the highest spin in the group. We trace back such degenerate
series of resonances (to be termed "mega states") to internal baryon structure
dominated by a quark -(rigid di-quark) configuration. Nucleon and Delta spectra
are, surprisingly enough, exact replicas to each other in the sense that each
of them features three mega states of equal quantum numbers. We fit positions
and splittings of the observed mega states by an algebraic Hamiltonian which
translates into a potential that is a combination of Coulomb- and Morse like
potentials and predict few more such degenerate series to be observed by the
TJNAF missing resonance program. Finally, we explore consequences of the model
for some electrodynamic properties of the spectra.

35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat