The Constituent Chiral Quark Model revisited |
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Authors: | Eduardo de Rafael |
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Affiliation: | Centre de Physique Théorique,11Unité Mixte de Recherche (UMR 6207) du CNRS et des Universités Aix Marseille 1, Aix Marseille 2 et Sud Toulon-Var, affiliée à la FRUMAM. CNRS-Luminy, Case 907, F-13288 Marseille Cedex 9, France |
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Abstract: | We reconsider the Constituent Chiral Quark Model of Manohar and Georgi in the presence of SUL(3)×SUR(3) external sources. As recently emphasized by Weinberg, the corresponding effective Lagrangian is renormalizable in the large-Nc limit. We show, however, that the number of the required counterterms depends crucially on the value of gA and it is minimized for gA=1. We then find that with a rather small value for the constituent quark mass, which we fix phenomenologically to MQ=(190±40) MeV, the model reproduces rather well the values of several well-known low-energy constants. We also comment on the limitations of the model as well as on a few exceptional applications, to more complicated low-energy observables, where one can expect the model to make reasonably good predictions. |
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