Original scientific paper
The extended chiral quark model in a Tamm-Dancoff inspired approximation
Dubravko Horvat
; Department of Physics, Faculty of Electrical Engineering, University of Zagreb, HR-10000 Zagreb, Croatia
Davor Horvatić
; Department of Physics, Faculty of Natural Sciences, University of Zagreb, HR-10000 Zagreb, Croatia
Boris Podobnik
; Department of Physics, Faculty of Natural Sciences, University of Zagreb, HR-10000 Zagreb, Croatia
Dubravko Tadić
; Department of Physics, Faculty of Natural Sciences, University of Zagreb, HR-10000 Zagreb, Croatia
Abstract
A procedure inspired by the Tamm-Dancoff method is applied to the chiral quark model which has been extended to include additional degrees of freedom: a pseudoscalar isoscalar field as well as a triplet of scalar isovector fields. The simpler, generic σ-model has been used before as a test for the Tamm-Dancoff inspired approximation (TDIA). The extended chiral quark model is employed here to investigate possible novel effects of the additional degrees of freedom as well as to point out the necessesity to introduce a SU(3) flavour. Model predictions for the axial-vector coupling constant and for the nucleon magnetic moment obtained in TDIA are compared with experimental values.
Keywords
extended chiral quark model; pseudoscalar isoscalar field; triplet of scalar isovector fields; Tamm-Dancoff approximation; SU(3) flavour; axial-vector coupling constant; nucleon magnetic moment
Hrčak ID:
303857
URI
Publication date:
1.10.2000.
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