Study of the e+e-→π+π-π0 process using initial state radiation with BABAR

The process e+ e- → π+ π- π0 γ has been studied at a center-of-mass energy near the Y(4S) resonance using a 89.3 fb-1 data sample collected with the BABAR detector at the PEP-II collider. From the measured 3π mass spectrum we have obtained the products of branching fractions for the ω and φ mesons, B(ω → e+ e-) B(ω → 3π) = (6.70 ± 0.06 ± 0.27) × 10 -5 and B(φ → e+e-)B(φ → 3π) = (4.30 ± 0.08 ± 0.21) × 10-5 and evaluated the e+ e- → π+ π- π0 cross section for the e+ e - center-of-mass energy range 1.05 to 3.00 GeV. About 900 e + e- → J/ψγ → π+ π- π0 γ events have been selected and the branching fraction B(J/ψ → π+ π- π0) = (2.18 ± 0.19)% has been measured.