Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-08
Prog.Theor.Phys. 109 (2003) 969-980
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 3 figures
Scientific paper
10.1143/PTP.109.969
Effects of the U_A(1) breaking interaction on the low-lying nonet scalar mesons are studied using the extended Nambu-Jona-Lasinio model. The strength of the U_A(1) breaking interaction is determined by the electromagnetic decays of the eta meson. We find that the U_A(1) breaking interaction gives rise to about 150 MeV mass difference between the sigma and a_0 mesons. We also find that the strangeness content in the \sigma 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.
Naito Kenichi
Oka Makoto
Takizawa Makoto
Umekawa Toru
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