Extraction of P{sub 11} resonances from {pi}N data.
We show that two P11 nucleon resonance poles near the {pi}{Delta} threshold, obtained in several analyses, are stable against large variations of parameters within a dynamical coupled-channels analysis based on meson-exchange mechanisms. By also performing an analysis based on a model with a bare nucleon state, we find that this two-pole structure is insensitive to the analytic structure of the amplitude in the region below the {pi}N threshold. Our results are Mpole=(1363-6+9-i79-5+3) and (1373-10+12-i114-9+14) MeV. We also demonstrate that the number of poles in the 1.5-GeV W 2-GeV region could be more than one, depending on how the structure of the single-energy solution of SAID is fitted. For three-pole solutions, our best estimated result of a pole near N(1710) listed by Particle Data Group is (1829-65+131-i192-110+88) MeV, which is close to the results of several previous analyses. Our results indicate the need for more accurate {pi}N reaction data in the W> 1.6-GeV region for high-precision resonance extractions.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Japan Society for the Promotion of Science, Grant in Aid for Scientific Research
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 984297
- Report Number(s):
- ANL/PHY/JA-66178; TRN: US1005258
- Journal Information:
- Physical Review C, Nuclear Physics, Vol. 81, Issue Jun. 22, 2010
- Country of Publication:
- United States
- Language:
- ENGLISH
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