Coupled-channel dynamics in the extended Lee-Friedrichs model shift the bare 2S nucleon state to the physical Roper resonance mass while reproducing five 1P-wave states.
Virtual states and the gen- eralized completeness relation in the Friedrichs model
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Understanding the 1P- and 2S-wave nucleon resonances within the extended Lee-Friedrichs Model
Coupled-channel dynamics in the extended Lee-Friedrichs model shift the bare 2S nucleon state to the physical Roper resonance mass while reproducing five 1P-wave states.