Suzuki, N.Juliá-Díaz, BrunoKamano, H.Lee, T. S. H.Matsuyama, A.Sato, T.2019-05-202019-05-202010-01-270031-9007https://hdl.handle.net/2445/133443We show that two almost degenerate poles near the π Δ threshold and the next higher mass pole in the P 11 partial wave of π N scattering evolve from a single bare state through its coupling with π N , η N , and π π N reaction channels. This finding provides new information on understanding the dynamical origins of the Roper N ∗ ( 1440 ) and N ∗ ( 1710 ) resonances listed by Particle Data Group. Our results for the resonance poles in other π N partial waves are also presented.4 p.application/pdfeng(c) American Physical Society, 2010Física de partículesMassa (Física)Particle physicsMass (Physics)info:eu-repo/semantics/article6227412019-05-20info:eu-repo/semantics/openAccess