Status of Nucleon Resonances with Masses $M<M_N+M_π$

Details Status of Nucleon Resonances with Masses $M<M_N+M_π$ Status of Nucleon Resonances with Masses $M<M_N+M_π$

2001-04-24

arxiv.org/abs/nucl-th/0104070v1

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures, LaTeX with ws-p8-50x6-00.cls. Talk presented at the NSTAR2001 Workshop, Mainz, Germany, March 7-10, 2001

Scientific paper

We discuss different interpretations of peaks observed a few years ago by Tatischeff et al. in missing mass spectra of the reaction $pp->pi^+pX$, which were declared as new exited nucleon states with small masses. A study of the possible production of such states in the process $\gamma p->pi^+N^*->pi^+ +\gamma\gamma n$ by analyzing the invariant mass spectrum of $\gamma\gamma n$ is proposed. It is shown that the data, obtained recently at MAMI-B, can allow to analyze this process and to get information about an existence of exited nucleon states with small masses.

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