The radiative decay phi - gamma pi pi in a coupled channel model and the   structure of f0(980)
  A coupled channel model is used to study the nature of the scalar mesons produced in the decay phi - gamma pi pi. The KKbar molecular picture of f0(980) is found to be in a good agreement with the recent experimental data from SND and CMD-2. The structure of the light scalar mesons is elucidated by investigating the S-matrix poles and the qqbar spectral density. 
V.E. Markushin (Paul Scherrer Institute, Switzerland)