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Phys. Rev. Lett. 104, 042302 (2010) [4 pages]

Disentangling the Dynamical Origin of P11 Nucleon Resonances

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N. Suzuki1,2, B. Juliá-Díaz3,2, H. Kamano2, T.-S. H. Lee2,4, A. Matsuyama5,2, and T. Sato1,2
1Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
2Excited Baryon Analysis Center (EBAC), Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
3Department d’Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Universitat de Barcelona, E–08028 Barcelona, Spain
4Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
5Department of Physics, Shizuoka University, Shizuoka 422-8529, Japan

Received 23 June 2009; published 27 January 2010

We show that two almost degenerate poles near the πΔ threshold and the next higher mass pole in the P11 partial wave of πN scattering evolve from a single bare state through its coupling with πN, ηN, and ππN 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 πN partial waves are also presented.

© 2010 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.104.042302
DOI:
10.1103/PhysRevLett.104.042302
PACS:
13.75.Gx, 13.60.Le, 14.20.Gk
 
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