Extraction of P11 resonances from pi N data
Jan, 2010
14 pages
Published in:
- Phys.Rev.C 81 (2010) 065207
e-Print:
- 1001.5083 [nucl-th]
Report number:
- JLAB-THY-10-1130
Citations per year
Abstract: (arXiv)
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 pi N threshold. Our results are M_pole = (1363^{+9}_{-6} -i79^{+3}_{-5}) MeV and (1373^{+12}_{-10} -i114^{+14}_{-9}) 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^{+131}_{-65} -i192^{+88}_{-110}) MeV which is close to the results of several previous analyses. Our results indicate the need of more accurate pi N reaction data in the W > 1.6 GeV region for high precision resonance extractions.Note:
- 15 pages, 4 figures
- 14.20.Gk
- 13.75.Gx
- 13.60.Le
References(0)
Figures(4)
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