English

A simple model to explain narrow nucleon resonances below the \pi N threshold

High Energy Physics - Phenomenology 2007-05-23 v1

Abstract

Several experiments suggest the existence of narrow excited states in the nucleon below the \pi N threshold. Taking all information together a series of states emerges at masses of 940, 966, 985, 1003, m_4, 1044, m_6, 1094 MeV above the nucleon ground state at 940 MeV with m_4 and m_6 missing. A model based on the excitation of collective states of the quark condensate is proposed explaining these states as multiple production of a ``genuine'' Goldstone Boson with a mass of \approx 20 MeV. The model also accounts in a natural way for the non-observation of m_4 and m_6. It suggests an explanation of the mass gap problem of the hadronic spectrum and a confinement mechanism.

Keywords

Cite

@article{arxiv.hep-ph/0111279,
  title  = {A simple model to explain narrow nucleon resonances below the \pi N threshold},
  author = {Thomas Walcher},
  journal= {arXiv preprint arXiv:hep-ph/0111279},
  year   = {2007}
}

Comments

4 pages, 3 figures

R2 v1 2026-07-22T13:37:38.006Z