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8th International Workshop on Meson Production, Properties and Interaction (MESON 2004), Krakow : Pologne
$\pi\pi$ Amplitudes Fitted to Experimental Data and to Roy's Equations
R. Kaminski, L. Lesniak, B. Loiseau1

The scalar-isoscalar, scalar-isotensor and vector-isovector pi-pi amplitudes are fitted simultaneously to experimental data and to Roy's equations. The resulting amplitudes are compared with those fitted only to experimental data. No additional constraints for the pi-pi threshold behaviour of the amplitudes are imposed. Threshold parameters are calculated for the amplitudes in the three waves. Spectrum of scalar mesons below 1.8 GeV is found from the analysis of the analytical structure of the fitted amplitudes.
1 :  LPNHE - Laboratoire de Physique Nucléaire et de Hautes Énergies
Physique/Physique des Hautes Energies - Phénoménologie
pion-pion interactions – Roy's equations – threshold parameters
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