V. Kulikov

TL;DR: In this paper, the authors measured the cross section σ(e+e−→π+π−γ) with the KLOE detector at DAΦNE, at an energy W=M>>\s φ>>\s =102 GeV from the dependence of the cross-section on $m(\pi^+\pi^{-})=\sqrt{W^2-2WE_\gamma}$�, where Ecffff γ is the energy of the photon radiated from the initial state.