Covariant calculation of strange decays of baryon resonances

Journal Article · Sat Sep 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.054008· OSTI ID:21027691

Sengl, B; Melde, T; Plessas, W ^[1]

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

We present results for kaon decay widths of baryon resonances from a relativistic study with constituent quark models. The calculations are done in the point form of Poincare-invariant quantum mechanics with a spectator-model decay operator. We obtain covariant predictions of the Goldstone-boson-exchange and a variant of the one-gluon-exchange constituent quark models for all kaon decay widths of established baryon resonances. They are generally characterized by underestimating the available experimental data. In particular, the widths of kaon decays with decreasing strangeness in the baryon turn out to be extremely small. We also consider the nonrelativistic limit, leading to the familiar elementary emission model, and demonstrate the importance of relativistic effects. It is found that the nonrelativistic approach evidently misses sensible influences from Lorentz boosts and some essential spin-coupling terms.

• OSTI ID: 21027691
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 5 Vol. 76; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
COUPLING
EMISSION
GLUONS
GOLDSTONE BOSONS
KAONS
PARTICLE WIDTHS
QUANTUM MECHANICS
QUARK MODEL
RELATIVISTIC RANGE
RESONANCE PARTICLES
SPIN
STRANGENESS