Covariant calculation of nonstrange decays of strange baryon resonances

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

DOI:https://doi.org/10.1103/PHYSREVC.76.025204· OSTI ID:21061993

Melde, T; Plessas, W; Sengl, B ^[1]

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1. Theoretische Physik, Institut fuer Physik, Karl-Franzens-Universitaet, Universitaetsplatz 5, A-8010 Graz (Austria)

We report on a study of {pi} and {eta} decays of strange baryon resonances within relativistic constituent-quark models based on one-gluon-exchange and Goldstone-boson-exchange dynamics. The investigations are performed in the point form of Poincare-invariant relativistic quantum mechanics with a spectator-model decay operator. The covariant predictions of the constituent-quark models underestimate the experimental data in most cases. These findings are congruent with an earlier study of nonstrange baryon decays in the light-flavor sector. We also consider a nonrelativistic reduction of the point-form spectator model, which leads to the decay operator of the elementary emission model. For some decays the nonrelativistic results differ substantially from the relativistic ones and they exhibit no uniform behavior as they scatter above and below the experimental decay widths.

• OSTI ID: 21061993
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 76; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ETA MESONS
FIELD OPERATORS
FLAVOR MODEL
GLUONS
GOLDSTONE BOSONS
HADRONIC PARTICLE DECAY
HYPERONS
PARTICLE WIDTHS
PIONS
QUANTUM MECHANICS
RELATIVISTIC RANGE
RESONANCE PARTICLES