Low Energy Parameters of the KK and Pipi Scalar-Isoscalar Interactions
R. Kaminski, L. Lesniak
Abstract
Threshold expansions of the ππ and KK spin 0 and isospin 0 scattering amplitudes are performed. Scattering lengths, effective ranges and so--called volume parameters are evaluated. Good agreement with the existing experimental data for the ππ scalar--isoscalar amplitude is found. An importance of future accurate measurements of the KK threshold parameters is stressed. New data are needed to understand the basic features of the scalar mesons.
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