中文摘要：

In a previous paper [Commun.Theor.Phys.,[arxiv:hep-ph11081451]],we proposed a method to distinguish poles of different dynamical origin,in unitarized amplitudes ofππ,KˉK system.That is based on the observation that "A Breit-Wigner resonance should exhibit two poles on different Riemann sheets which meet each other on the real axis when N c = ∞".In this paper,we extend our previous work [Commun.Theor.Phys.,[arXiv:hep-ph11081451]] to the ππ-KˉK-ηη three channel system.We reconfirm most of the predictions in our previous work [Commun.Theor.Phys.,[arxiv:hep-ph11081451]].Especially the f 0(980) is of KˉK molecule nature.Other poles,including the σ,are of Breit-Wigner type.

英文摘要：

In a previous paper [Commun. Theor. Phys., [arxiv：hep-ph/11081451]], guish poles of different dynamical origin, in unitarized amplitudes of ππ, K K system. that ＂A Breit-wigner resonance should exhibit two poles on different Riemann sheets axis when Nc = ∞＂. In this paper, we extend our previous work [Commun. Theor. to the ππ-KK=ηη three channel system. We reconfirm most of the predictions in our Phys., [arxiv：hep-ph/11081451]]. Especially the fo（980） is of KK molecule nature. 0 Breit-WJgner type. we proposed a method to distinThat is based on the observation which meet each other on the real phys,[arXiv：hep,ph/11081451]]pres.ious work ： Theor. ther poles, including the σ,are of Breit-wigner type.