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

Abstract

The process e⁺e⁻→π⁺π⁻π⁰γ has been studied at a center-of-mass energy near the Υ(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⁻π⁰γ events have been selected and the branching fraction B(J/ψ→π⁺π⁻π⁰)=(2.18±0.19)% has been measured.