Peculiarities in Multichannel Interaction Amplitudes for Meson--Meson Scattering and Scalar Meson Spectroscopy

/ Authors

/ Abstract

Interactions in coupled channels pipi, KKbar and an effective 2pi2pi in scalar-isoscalar wave have been analysed. Influence of interchannel couplings on analytical structure of multichannel interaction amplitudes has been studied. Interplay of S-matrix zeroes and poles and their relation with parameters of scalar resonances has been investigated.