Nucleon resonances in {pi}N scattering up to energies {radical}(s){<=}2.0 GeV

Journal Article · Sat Sep 15 04:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.76.035206· OSTI ID:21064376

Chen, G Y; Yang, S N ^[1]; Kamalov, S S ^[1]; Drechsel, D; Tiator, L ^[2]

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1. Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei 10617, Taiwan (China)
2. Institut fuer Kernphyik, Universitaet Mainz, D-55099 Mainz (Germany)

A meson-exchange model for pion-nucleon scattering was previously constructed using a three-dimensional reduction scheme of the Bethe-Salpeter equation for a model Lagrangian involving {pi},{eta},N,{delta},{rho}, and {sigma} fields. We thereby extend our previous work by including the {eta}N channel and all the {pi}N resonances with masses {approx}2 GeV, up to the F waves. The effects of the {pi}{pi}N channels are taken into account by introducing an effective width in the resonance propagators. The extended model gives an excellent fit to both {pi}N phase shifts and inelasticity parameters in all channels, except F{sub 17}, up to the F waves and for energies below 2 GeV. We present a new scheme for extracting the properties of overlapping resonances. The predicted values for the resonance masses and widths as well as resonance pole positions and residues are compared with the listing of the Particle Data Group.

• OSTI ID: 21064376
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BETHE-SALPETER EQUATION
BOSON-EXCHANGE MODELS
F WAVES
GEV RANGE
LAGRANGIAN FUNCTION
NUCLEONS
PARTICLE WIDTHS
PHASE SHIFT
PION-NUCLEON INTERACTIONS
PROPAGATOR
RESONANCE PARTICLES
REST MASS
SCATTERING
THREE-DIMENSIONAL CALCULATIONS