Precision measurement of σ ( e + e − → π + π − γ ) / σ ( e + e − → μ + μ − γ ) and determination of the π + π − contribution to the muon anomaly with the KLOE detector

Precision measurement of σ ( e + e − → π + π − γ ) / σ ( e + e − → μ + μ − γ ) and determination of the π + π − contribution to the muon anomaly with the KLOE detector