Pion scalar form factor and model independent values of $f_0(500)$ and $f_0(980)$ meson parameters

The pion scalar form factor along with all existing S-wave iso-scalar $\pi \pi$-scattering phase shift data in the elastic region up to $1 {\rm GeV}^2$areappliedforadeterminationofthe$f_0(500)$and$f_0(980)$ meson parameters $m_{f_0(500)}=(360\pm 33)\mathrm{M}\mathrm{e}\mathrm{V}$, $\Gamma_{f_0(500)}=(587\pm 85){\rm MeV}$and$m_{f_0(980)}=(957\pm77) {\rm MeV}$,$\Gamma_{f_0(980)}=(164\pm142){\rm MeV}$ in a model independent way.