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

Abstract

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 $m({\pi }^{+}{\pi }^{-})=\sqrt{W^2-2W{E}_{\gamma }}$, 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 $0.35<m^2({\pi }^{+}{\pi }^{-})<0.95$ GeV${}^2$. From our result we extract the pion form factor and the hadronic contribution to the muon anomaly, $a_{\mu }$.

Contributed paper to EPS 2003 and LP 2003

Cited by in corpus (4)

• CODATA Recommended Values of the Fundamental Physical Constants: 2010
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts
• Quest for precision in hadronic cross sections at low energy: Monte Carlo tools vs. experimental data
• Improved ${\alpha }^4$ Term of the Muon Anomalous Magnetic Moment