Study of the process e(+)e(-) -> omega pi(0) in the phi-meson mass region with the KLOE detector

We have studied the e+e− → ωπ0 cross section in the √ s interval 1000–1030 MeV using the π+π−π0π0 and π0π0γ final states with a sample of ∼ 600 pb−1 collected with the KLOE detector at DANE. By fitting the observed interference pattern around Mφ for both final states, we extract the ratio of the decay widths Γ (ω→π0γ )/Γ (ω→π+π−π0) = 0.0897 ± 0.0016 and derive the branching fractions BR(ω → π+π−π0) = (90.24 ± 0.19)%, BR(ω → π0γ ) = (8.09 ± 0.14)%. The parameters describing the e+e− →π+π−π0π0 reaction around Mφ are also used to extract the branching fraction for the OZI and G-parity violating φ→ωπ0 decay: BR(φ→ωπ0) = (4.4±0.6)×10−5.