Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2010-08-02
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.
Kamano Hiroyuki
Lee T. S. -H.
Nakamura Satoshi. X.
Sato Takeshi
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