Abstract
We discuss the lightest scalar resonances, f 0 ( 600 ) , κ ( 800 ) , a 0 ( 980 ) and f 0 ( 980 ) in the extended Nambu–Jona-Lasinio model. We find that the model parameters can be tuned, but unnaturally, to accommodate those scalars except the f 0 ( 980 ) . We also discuss problems encountered in the K-matrix unitarization approximation by using N c counting technique.
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