ar X iv : h ep - p h / 04 10 05 1 v 1 4 O ct 2 00 4 Problem of Light Scalar Mesons ∗
نویسنده
چکیده
The following topics are considered. 1. Confinement, chiral dynamics and light scalar mesons. 2. φ-meson radiative decays about nature of light scalar resonances. Arguments in favor of the four-quark model of the a 0 (980) and f 0 (980) mesons are given. To discuss actually the nature of the putative nonet of the light scalar mesons: the red putative f 0 (600) (or σ(600)) and κ(700−900) mesons and the red well established f 0 (980) and a 0 (980) mesons, one should explain not only their mass spectrum, particularly the mass degeneracy of the f 0 (980) and a 0 (980) states, but answer the next real challenges. 1. The copious φ → γf 0 (980) decay and especially the copious φ → γa 0 (980) decay, which looks as the decay plainly forbidden by the Okubo-Zweig-Izuka (OZI) rule in the quark-antiquark model a 0 (980) = (u¯ u − d ¯ d)/ √ 2.
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