Measurement of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma (\gamma ))$ and the dipion contribution to the muon anomaly with the KLOE detector

KLOE Collaboration

We have measured the cross section $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma (\gamma ))$ at DA$\Phi$NE, the Frascati ϕ-factory, using events with initial state radiation photons emitted at small angle and inclusi…