Pole Analysis of Unitarized One Loop χ PT Amplitudes——A Triple Channel Study

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.