%0 Book Section
%T Dispersive chiral approach to meson-meson dynamics: Spectroscopy results for light scalars and precision studies
publisher Amer Inst Physics
%D 2007
%U 978-0-7354-0396-3
%@ https://hdl.handle.net/20.500.14352/53483
%X Dispersive approaches provide model independent  description of meson-meson scattering. We first review here the use of dispersion relations to obtain a model independent unitarization of Chiral Perturbation Theory amplitudes, that establish the existence of light scalar mesons and whose leading 1/N_c behavior suggest they ahve a non q q̅ dominant component. We also review the forward dispersion relation checks on conflicting experimental data and the resulting very precise pi pi scattering scattering amplitudes.
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