Singularity structure of the {pi}N scattering amplitude in a meson-exchange model up to energies W{<=}2.0 GeV

Journal Article · Mon Nov 15 04:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.055203· OSTI ID:21499211

Tiator, L; Drechsel, D ^[1]; Kamalov, S S ^[1]; Ceci, S; Svarc, A ^[2]; Chen, Guan Yeu; Yang, Shin Nan ^[3]

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1. Institut fuer Kernphyik, Universitaet Mainz, D-55099 Mainz (Germany)
2. Rudjer Boskovic Institute, Division of Experimental Physics, HR-10002 Zagreb (Croatia)
3. Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan (China)

Within the previously developed Dubna-Mainz-Taipei meson-exchange model, the singularity structure of the {pi}N scattering amplitudes has been investigated. For all partial waves up to F waves and c.m. energies up to W{approx}2 GeV, the T-matrix poles have been calculated by three different techniques: analytic continuation into the complex energy plane and speed-plot and regularization method. For all four-star resonances except the S{sub 11}(1535), we find very good agreement between the analytic continuation and the regularization method. We also find resonance poles for resonances that are not so well established, but in these cases the pole positions and residues obtained by analytic continuation can substantially differ from the results predicted by the speed-plot and regularization methods.

• OSTI ID: 21499211
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 5 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
AMPLITUDES
BOSON-EXCHANGE MODELS
ENERGY RANGE
F WAVES
GEV RANGE
GEV RANGE 01-10
MATHEMATICAL MODELS
MATRICES
PARTIAL WAVES
PARTICLE MODELS
PERIPHERAL MODELS
RESIDUES
RESONANCE
S MATRIX
SCATTERING AMPLITUDES
SINGULARITY
VELOCITY