Determination of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-})$ from radiative processes at DA$\Phi$NE

The KLOE Collaboration, A. Aloisio

We have measured the cross section $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma )$ with the KLOE detector at DA$\Phi$NE, at an energy $W=M_{\varphi }=1.02$ GeV. From the dependence of the cross section on $m(π^+π^-)=\s…