  We study phenomenologically the invariant mass spectra of scalar dipion
states produced in cascade decays of excited $\Upsilon$ and $\psi$, and
$J/\psi$ decays into light vector meson. Dipion production amplitude is given
as a product of the Born term and an effective scalar form factor written in
terms of a unitarized chiral theory. The model reproduces the experimental mass
spectra very well.
