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MEASUREMENT OF THE HADRONIC CROSS SECTION VIA RADIATIVE RETURN AT DAΦNE

    https://doi.org/10.1142/S0217751X05023670Cited by:4 (Source: Crossref)

    The cross section σ(e+e-→π+π-γ) has been measured with the KLOE detector at the electron-positron collider DAΦNE, at an energy W=mϕ=1.02 GeV. We perform this measurement as a function of the π+π- invariant mass, Mππ. The photon in the above process is due to Initial State Radiation. Dividing by a theoretical radiator function, we obtain the cross section σ(e+e-→π+π-) for the mass range with an overall accuracy of 1.3%. We also calculate the hadronic contribution of the two-pion channel to the anomalous magnetic moment of the muon for the given mass range: .

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