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arXiv · 1008.0214

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

S. X. Nakamura·H. Kamano·T. -S. H. Lee·T. Sato
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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.

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S. X. Nakamura, H. Kamano, T. -S. H. Lee, T. Sato. 2010-08-02. Extraction of P11 Resonance from pi-N Data and Its Stability. https://doi.org/10.1088/1742-6596%2F312%2F3%2F032016

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