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 $pipi$-scattering phase shift data in the elastic region up to $1 {rm GeV}^2$ are applied for a determination of the $f_0(500)$ and $f_0(980)$ meson parameters $m_{f_0(500)}=(360pm33){rm MeV}$, $Gamma_{f_0(500)}=(587pm 85){rm MeV}$ and $m_{f_0(980)}=(957pm77) {rm MeV}$, $Gamma_{f_0(980)}=(164pm142){rm MeV}$ in a model independent way.

Two-Photon Decay Rates of True Neutral Pseudoscalar Mesons from Data on their Transition Form Factors

By means of the universal unitary and analytic model of electromagnetic structure of hadrons the two-photon decay rates of P=pi^0, eta, eta mesons are determined in an alternative way from data on their transition form factors.