Extraction of P11 Resonance from pi-N Data and Its Stability

Details Extraction of P11 Resonance from pi-N Data and Its Stability Extraction of P11 Resonance from pi-N Data and Its Stability

2010-08-02

arxiv.org/abs/1008.0214v1

J.Phys.Conf.Ser.312:032016,2011

Physics

Nuclear Physics

Nuclear Theory

6 pages, 8 figures, Contribution to the proceedings of 24th International Nuclear Physics Conference (INPC), Vancouver, Canada

Scientific paper

10.1088/1742-6596/312/3/032016

An important question about resonance extraction is how much resonance poles and residues extracted from data depend on a model used for the extraction, and on the precision of data. We address this question with the dynamical coupled-channel (DCC) model developed in Excited Baryon Analysis Center (EBAC) at JLab. We focus on the P11 pi-N scattering. We examine the model-dependence of the poles by varying parameters to a large extent within the EBAC-DCC model. We find that two poles associated with the Roper resonance are fairly stable against the variation. We also develop a model with a bare nucleon, thereby examining the stability of the Roper poles against different analytic structure of the P11 amplitude below pi-N threshold. We again find a good stability of the Roper poles.

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