Abstract
We present a study of the process e+e−→π+π−π0 at BABAR using the initial-state radiation technique. The analysis is based on the full BABAR data set, 469fb−1, recorded at and near the ϒ(4S) resonance. From the fit to the measured three pion mass spectrum we determine the products Γ(V→e+e−)B (V→π+π−π0) for the ω and ϕ resonances, and the branching ratio B (ρ→π+π−π0). The latter isospin-breaking decay is observed with 6σ significance. The e+e−→π+π−π0 cross section is measured from 0.62 GeV to 3.5 GeV. The measured cross section is used to calculate the leading-order hadronic contribution to the muon anomalous magnetic moment from this exclusive final state with improved accuracy. A short status is given on the current discrepancy between the predicted value and the measured value of the muon anomalous magnetic moment.
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