Covariant calculation of mesonic baryon decays

Abstract

We present covariant predictions for pi and eta decay modes of N and Delta resonances from relativistic constituent-quark models based on one-gluon-exchange and Goldstone-boson-exchange dynamics. The results are calculated within the point-form approach to Poincare-invariant relativistic quantum mechanics applying a spectator-model decay operator. The direct predictions of the constituent-quark models for covariant pi and eta decay widths show a behaviour completely different from previous ones calculated in nonrelativistic or so-called semirelativistic approaches. It is found that the present theoretical results agree with experiment only in a few cases but otherwise always remain smaller than the experimental data (as compiled by the Particle Data Group). Possible reasons for this behaviour are discussed with regard to the quality of both the quark-model wave functions and the mesonic decay operator.

10 pages, 2 figures, accepted for publication in Phys. Rev. C

References in corpus (5)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Baryon Form Factors of Relativistic Constituent-Quark Models
• Covariant baryon charge radii and magnetic moments in a chiral constituent quark model
• Vector mesons in a relativistic point-form approach
• Quark model description of hadrons

Cited by in corpus (18)

• Baryon spectroscopy
• Quark-Model Identification of Baryon Ground and Resonant States
• Strong decays of baryons and missing resonances
• The role of $qqqq\bar{q}$ components in the nucleon and the N(1440) resonance
• Electromagnetic nucleon form factors in instant and point form
• The role of $q\bar{q}$ components in the N(1440) resonance
• Nucleon resonances in the fourth resonance region
• Delta-baryon mass in a covariant Faddeev approach
• Structure of meson-baryon interaction vertices
• Five-quark components in $\Delta (1232)\to N\pi$ decay
• Covariant calculation of nonstrange decays of strange baryon resonances
• Roper resonances in chiral quark models
• Chiral restoration in excited nucleons versus SU(6)
• Covariant calculation of strange decays of baryon resonances
• Electromagnetic Properties of Few-Body Systems Within a Point-Form Approach
• Quark model study of the $\pi N\to \pi N$ reactions up to the $N(1440)$ resonance region
• Baryon resonances and strong decays
• Electromagnetic $N-\Delta (1232)$ transitions within the point-form of relativistic quantum mechanics