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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 12, 91-101 (2001)

Hadronic decays of N and $\Delta$ resonances in a chiral quark model

L. Theußl1, R.F. Wagenbrunn2, B. Desplanques1 and W. Plessas3

1  Institut des Sciences Nucléaires (Unité Mixte de Recherche CNRS-IN2P3, UJF) F-38026 Grenoble Cedex, France
2  Dipartimento di Fisica Nucleare e Teorica, Università di Pavia and INFN, Pavia 27100, Italy
3  Institut für Theoretische Physik, Universität Graz, Universitätsplatz 5, A-8010 Graz, Austria

lukas@isn.in2p3.fr

(Received: 11 May 2001 / Revised version: 3 July 2001 Communicated by P. Schuck)

Abstract
$\pi$ and $\eta$ decay modes of light baryon resonances are investigated within a chiral quark model whose hyperfine interaction is based on Goldstone-boson exchange. For the decay mechanism a modified version of the 3P0 model is employed. Our primary aim is to provide a further test of the recently proposed Goldstone-boson exchange constituent quark model. We compare the predictions for $\pi$ and $\eta$ decay widths with experiment and also with results from a traditional one-gluon exchange constituent quark model. The differences between nonrelativistic and semirelativistic versions of the constituent quark models are outlined. We also discuss the sensitivity of the results on the parameterization of the meson wave function entering the 3P0 model.

PACS
12.39.Pn - Potential models.
13.30.Eg - Hadronic decays.
14.20.Gk - Baryon resonances with S=0 .

© Società Italiana di Fisica, Springer-Verlag 2001

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