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YITP Workshop on Possible Existence of the sigma meson and it Implications to Hadron Physics (sigma-meson 2000), Kyoto : Japon (2000)
Scalar meson spectroscopy: achievements and traps
R. Kaminski, L. Lesniak, B. Loiseau1
(2000)

Interactions in three coupled channels: pi-pi, K-anti K and sigma-sigma have been investigated in a wide two-pion effective mass region from the pi-pi threshold up to 1600 MeV. Analytical structure of amplitudes in all channels has been studied. It was shown that its knowledge is necessary to understand spectrum of scalar mesons and their nature.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physique/Physique des Hautes Energies - Phénoménologie
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/hep-ph/0009007