η′q¯q and η′NN vertex suppression in effective theories

  • D. Lehmann
Short notes


In an effective theory containing only quark degrees of freedom, such as the extended Nambu–Jona–Lasinio model, the influence of the axial anomaly can be incorporated by a self-interaction of the 't Hooft determinant type. I will show that despite the threshold problem related to the η′ meson this leads to a significant suppression of the η′ coupling gη′q¯q to dynamical quarks which suggests a suppression of the η′NN vertex as compared to the ηNN vertex.

PACS: 13.75-n Hadron-induced low- and intermediate-energy reactions and scattering – 14.40.Cs Other mesons with S=C=0, mass <2.5 GeV – 12.39-x Phenomenological quark models 

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • D. Lehmann
    • 1
  1. 1.Institut für Theoretische Physik III, Universität Erlangen-Nürnberg, Staudtstrasse 7, D-91058 Erlangen, Germany, (e-mail:

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