Measurement of sigma(e+ e- -> pi+ pi-) from threshold to 0.85 GeV^2 using Initial State Radiation with the KLOE detector

Abstract

We have measured the cross section of the radiative process e+e- -> pi+pi-gamma with the KLOE detector at the Frascati phi-factory DAPHNE, from events taken at a CM energy W=1 GeV. Initial state radiation allows us to obtain the cross section for e+e- -> pi+pi-, the pion form factor |F_pi|^2 and the dipion contribution to the muon magnetic moment anomaly, Delta a_mu^{pipi} = (478.5+-2.0_{stat}+-5.0_{syst}+-4.5_{th}) x 10^{-10} in the range 0.1 < M_{pipi}^2 < 0.85 GeV^2, where the theoretical error includes a SU(3) ChPT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of a_mu and the value measured by the Muon g-2 collaboration at BNL is confirmed.

17 pages, 11 figures, revised treatment of FSR uncertainty, version to appear on Physics Letters B

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• Measurement of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma )$ and extraction of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-})$ below 1 {\rm GeV} with the KLOE detector
• Update of the e^+e^-\toπ^+π^- cross section measured by SND detector in the energy region 400<\sqrt{s}<1000 MeV
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• Measurement of $\sigma (e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\gamma (\gamma ))$ and the dipion contribution to the muon anomaly with the KLOE detector
• Measuring sigma(e^+e^- \to hadrons) using tagged photon
• Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR
• Radiative return at NLO and the measurement of the hadronic cross-section in electron-positron annihilation
• Large-angle Bhabha scattering and luminosity at flavour factories
• Measurement of the e+e- -> pi+pi- cross section with the CMD-2 detector in the 370-520 MeV c.m. energy range
• Data handling, reconstruction, and simulation for the KLOE experiment
• Precision measurements of sigma_hadronic for alpha_eff(E) at ILC energies and (g-2)_mu
• The radiative return at phi- and B-factories: small-angle photon emission at next to leading order
• Study of the decay phi--> f0(980)g --> pi+pi-g with the KLOE detector
• The radiative return at phi- and B-factories: FSR at next-to-leading order
• Measurement of the DA$\Phi$NE luminosity with the KLOE detector using large angle Bhabha scattering
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