Extraction of P11 Resonance from pi-N Data and Its Stability
Abstract
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.
Keywords
Cite
@article{arxiv.1008.0214,
title = {Extraction of P11 Resonance from pi-N Data and Its Stability},
author = {S. X. Nakamura and H. Kamano and T. -S. H. Lee and T. Sato},
journal= {arXiv preprint arXiv:1008.0214},
year = {2011}
}
Comments
6 pages, 8 figures, Contribution to the proceedings of 24th International Nuclear Physics Conference (INPC), Vancouver, Canada, 4-9 July 2010