Extraction of $$P_{11}$$ Resonance from piN Data and Its Stability
We address a question about how much resonance poles and residues extracted from data depend on a model used for the extraction, and on the precision of data. We focus on the P{sub 11} {pi}-N scattering and use the dynamical coupled-channel (DCC) model developed in Excited Baryon Analysis Center (EBAC) at JLab. We examine the model-dependence of the poles by varying parameters largely within the EBAC-DCC model. We find that two poles associated with the Roper resonance are fairly stable against the variation. We also study the stability of the Roper poles against different analytic structure of the P{sub 11} amplitude below {pi}-N threshold by using a bare nucleon model. We again find a good stability of the Roper poles.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1029593
- Report Number(s):
- JLAB-THY-10-1313; DOE/OR/23177-1569; arXiv:1010.0223; TRN: US1105810
- Resource Relation:
- Conference: MENU 2010, 31 May - 4 Jun 2010, Williamsburg, Virginia
- Country of Publication:
- United States
- Language:
- English
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P_11 Resonance Extracted from pi-N Data and Its Stability
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