ar X iv : h ep - p h / 98 03 29 2 v 3 2 8 O ct 1 99 8 NATURE OF THE SCALAR a 0 ( 980 ) AND f 0 ( 980 ) - MESONS

ar X iv : h ep - p h / 98 03 29 2 v 2 1 1 M ar 1 99 8 NATURE OF THE SCALAR a 0 ( 980 ) AND f 0 ( 980 ) - MESONS

It is presented a critical consideration of all unusual properties of the scalar a 0 (980) and f 0 (980)-mesons in the four-quark, two-quark and molecular models. The arguments are adduced that the four-quark model is more preferable. It is discussed the complex of experiments that could finally resolve this issue.

ar X iv : h ep - p h / 98 03 29 2 v 1 1 0 M ar 1 99 8 NATURE OF THE SCALAR a 0 ( 980 ) AND f 0 ( 980 ) - MESONS

It is presented a critical consideration of all unusual properties of the scalar a 0 (980) and f 0 (980)-mesons in the four-quark, two-quark and molecular models. The arguments are adduced that the four-quark model is more preferable. It is discussed the complex of experiments that could finally resolve this issue.

ar X iv : h ep - p h / 04 10 05 1 v 1 4 O ct 2 00 4 Problem of Light Scalar Mesons ∗

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 ...

ar X iv : h ep - p h / 02 03 04 2 v 2 4 A pr 2 00 2 Once more on mixing of the a 0 ( 980 ) and f 0 ( 980 ) mesons

ar X iv : h ep - p h / 03 10 23 7 v 1 2 0 O ct 2 00 3 Large N c behavior of light resonances in meson - meson scattering

By scaling the parameters of meson-meson unitarized Chiral Perturbation Theory amplitudes according to the QCD large N c rules, one can study the spectroscopic nature of light meson resonances. The scalars σ , κ f 0 (980) and, possibly, the a 0 (980) do not seem to behave as ¯ qq states, in contrast to the vectors ρ(770) and K * (892). The behavior shown by the scalars is naturally explained in...