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Measurement of [formula omitted] from threshold to 0.85 GeV2 using initial state radiation with the KLOE detector

Authors
Journal
Physics Letters B
0370-2693
Publisher
Elsevier
Publication Date
Volume
700
Issue
2
Identifiers
DOI: 10.1016/j.physletb.2011.04.055
Keywords
  • Experiments
Disciplines
  • Physics

Abstract

Abstract We have measured the cross section of the radiative process e+e−→π+π−γ with the KLOE detector at the Frascati ϕ-factory DAΦNE, from events taken at a CM energy W=1 GeV. Initial state radiation allows us to obtain the cross section for e+e−→π+π−, the pion form factor |Fπ|2 and the dipion contribution to the muon magnetic moment anomaly, Δaμππ=(478.5±2.0stat±5.0syst±4.5th)×10−10 in the range 0.1<Mππ2<0.85 GeV2, where the theoretical error includes a SU(3) χPT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of aμ and the value measured by the Muon g-2 collaboration at BNL is confirmed.

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