Determination of $σ(e^+e^-\to π^+ π^-)$ from radiative processes at DA$Φ$NE

Details Determination of $σ(e^+e^-\to π^+ π^-)$ from radiative processes at DA$Φ$NE Determination of $σ(e^+e^-\to π^+ π^-)$ from radiative processes at DA$Φ$NE

2003-07-17

arxiv.org/abs/hep-ex/0307051v2

Eur.Phys.J.C33:s656-s658,2004

Physics

High Energy Physics

High Energy Physics - Experiment

Contributed paper to EPS 2003 and LP 2003

Scientific paper

10.1140/epjcd/s2004-03-1613-4

We have measured the cross section $\sigma(e^+e^-\to\pi^+\pi^-\gamma)$ with the KLOE detector at DA$\Phi$NE, at an energy $W=M_\phi=1.02$ GeV. From the dependence of the cross section on $m(\pi^+\pi^-)=\sqrt{W^2-2WE_\gamma}$, where $E_\gamma$ is the energy of the photon radiated from the initial state, we extract $\sigma(e^+e^-\to\pi^+\pi^-)$ for the mass range $0.35

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