On the scalar nonet in the extended Nambu Jona-Lasinio model
Abstract
We discuss the lightest scalar resonances, f0(600), (800), a0(980) and f0(980) in the extended Nambu Jona-Lasinio model. We find that the model parameters can be tuned, but unnaturally, to accommodate for those scalars except the f0(980). We also discuss problems encountered in the K Matrix unitarization approximation by using Nc counting technique.
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