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.

6 pages, 8 figures, Contribution to the proceedings of 24th International Nuclear Physics Conference (INPC), Vancouver, Canada, 4-9 July 2010

References in corpus (8)

• Extended Partial-Wave Analysis of piN Scattering Data
• Dynamical coupled-channel model of meson production reactions in the nucleon resonance region
• Disentangling the dynamical origin of P11 Nucleon Resonances
• Dynamical Coupled-Channel Model of $\pi N$ Scattering in the W $\le$ 2 GeV Nucleon Resonance Region
• Extraction of Resonances from Meson-Nucleon Reactions
• Extraction of P11 resonances from pi N data
• Extraction of Electromagnetic Transition Form Factors for Nucleon Resonances within a Dynamical Coupled-Channels Model
• On the Methods for Constructing Meson-Baryon Reaction Models within Relativistic Quantum Field Theory