Do we have three S11 resonances in the second resonance region?
Zhenping Li, Ron Workman
Abstract
We review the status of the S11 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 S11 resonance in this energy range. This suggests that a KΣ or KΛ quasi-bound state may indeed exist below the kaon production threshold. We show that kaon production experiments, in particular K0 photoproduction off nucleons, would be very sensitive to the existence of the third S11 resonance.
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