Study of the process e+e−→ωπ0 in the ϕ-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 ∼600pb−1 collected with the KLOE detector at DAΦNE. 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.