Measurement of $σ(e^+e^-\toπ^+π^-γ(γ))$ and the dipion contribution to the muon anomaly with the KLOE detector

Details Measurement of $σ(e^+e^-\toπ^+π^-γ(γ))$ and the dipion contribution to the muon anomaly with the KLOE detector Measurement of $σ(e^+e^-\toπ^+π^-γ(γ))$ and the dipion contribution to the muon anomaly with the KLOE detector

2008-09-23

arxiv.org/abs/0809.3950v2

Phys.Lett.B670:285-291,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Minor text revisions, version to appear on Physics Letters B

Scientific paper

10.1016/j.physletb.2008.10.060

We have measured the cross section $\sigma(e^+e^-\to\pi^+\pi^-\gamma(\gamma))$ at DA$\Phi$NE, the Frascati \phi-factory, using events with initial state radiation photons emitted at small angle and inclusive of final state radiation. We present the analysis of a new data set corresponding to an integrated luminosity of 240 pb$^{-1}$. We have achieved a reduced systematic uncertainty with respect to previously published KLOE results. From the cross section we obtain the pion form factor and the contribution to the muon magnetic anomaly from two pion states in the mass range $0.592 < M_{\pi\pi} < 0.975$ GeV. For the latter we find $\Delta a^{\pi\pi}_\mu = (387.2\pm0.5_{\rm stat}\pm2.4_{\rm exp}\pm2.3_{\rm th})\times 10^{-10}$

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