UA(1) Breaking Effects on the Light Scalar Meson Spectrum
Abstract
Effects of the UA(1) breaking interaction on the low-lying nonet scalar mesons are studied using the extended Nambu-Jona-Lasinio model. The strength of the UA(1) breaking interaction is determined by the electromagnetic decays of the eta meson. We find that the UA(1) breaking interaction gives rise to about 150 MeV mass difference between the sigma and a0 mesons. We also find that the strangeness content in the σ meson is about 15%. The calculated mass of the I=1/2 state is about 200 MeV heavier than that of the I=1 state. The order of these masses is not likely to change within this model.
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