Measuring the Hadronic Cross Section at KLOE using the Radiative Return
Abstract
We present a study of the reaction e+e- pi+pi-gamma at the phi peak with the KLOE detector at the phi-factory DAPHNE. This reaction allows us to obtain the cross section for +e- pi+pi- from the e+e- center-of-mass energy W = mφ = 1019 MeV down to threshold, i.e. 2mpi < M(pipi) < mphi. This is called radiative return. The status of the analysis and preliminary results on the invariant mass spectrum of the two-pion-state are presented.
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