Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-05-23
Phys.Rev. C72 (2005) 015207; Erratum-ibid. C74 (2006) 069901
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 figures, accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.72.015207
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.
Melde T.
Plessas Willibald
Wagenbrunn Robert F.
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