Baryon Resonances in the 1/N_c Expansion
Abstract
The 1/N_c expansion of QCD provides a valuable semiquantitative tool to study baryon scattering amplitudes and the short-lived baryon resonances embedded within them. A generalization of methods originally applied in chiral soliton models in the 1980's provides the key to deriving a rigorous 1/N_c expansion. One obtains model-independent relations among amplitudes that impose mass and width degeneracies among resonances of various quantum numbers. Phenomenological evidence confirms that patterns of resonant decay predicted by 1/N_c agree with data. One may extend the analysis to subleading orders in 1/N_c, where again agreement with data is evident, in both meson-baryon scattering and pion photoproduction.
Cite
@article{arxiv.hep-ph/0501021,
title = {Baryon Resonances in the 1/N_c Expansion},
author = {Richard F. Lebed},
journal= {arXiv preprint arXiv:hep-ph/0501021},
year = {2017}
}
Comments
12 pages, 4 eps figures, includes style files. Invited talk at ECT* Workshop on Large N_c QCD 2004, 5-9 July 2004, Trento, Italy