Do we have three $S_{11}$ resonances in the second resonance region?

Details Do we have three $S_{11}$ resonances in the second resonance region? Do we have three $S_{11}$ resonances in the second resonance region?

1995-11-30

arxiv.org/abs/nucl-th/9511041v1

Phys.Rev.C53:549-552,1996

Physics

Nuclear Physics

Nuclear Theory

9 pages and 1 figure. The figure is available at ftp://clsaid.phys.vt.edu/pub/pr/s11.ps

Scientific paper

10.1103/PhysRevC.53.549

We review the status of the $S_{11}$ N$^*$ resonances in light of some recent theoretical and phenomenological results. Whereas the quark model predicts two such resonances around 1.6 GeV, there is considerable evidence for a third $S_{11}$ resonance in this energy range. This suggests that a $K\Sigma$ or $K\Lambda$ quasi-bound state may indeed exist below the kaon production threshold. We show that kaon production experiments, in particular $K^0$ photoproduction off nucleons, would be very sensitive to the existence of the third $S_{11}$ resonance.

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