Abstract
Using standard techniques, the Nambu-Jona-Lasinio Lagrangian with its chirally invariant four-fermion couplings is transformed into a bosonized form which includes scalar, pseudo-scalar, vector and axial-vector fields. Then, after eliminating the scalar and axialvector fields in an appropriate way, we obtain the Lagrangian given by Bando et al. based on the “hidden” local symmetry approach, except that in the present approach the free parametera of their model is now uniquely given by a=(1− M 2V /M 2A )−1 in terms of the vector and axial-vector meson massesM V andM A. The value ofa=2, which led them to remarkable phenomenological successes is therefore directly connected with the Weinberg mass relation MA=√2MV in this model. The formal equivalence between the hidden symmetry approach and the massive Yang-Mills scheme is clearly demonstrated in the present approach, which derives an effective meson theory starting from a Lagrangian at the underlying quark level.
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Work supported in part by Bundesministerium für Forschung und Technologie, grant MEP 0234 REA, and by Deutsche Forschungsgemeinschaft, grant We 655/9-2
On leave from Osaka University, Japan
The authors would like to thank H. Forkel, M. Schaden, N. Kaiser and Y. Fujiwara for many helpful and stimulating discussions.