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(-) -> omega pi(0) cross section in the root s interval 1000-1030 MeV using the pi(+)pi(-)pi(0)pi(0) and pi(0)pi(0)gamma final states with a sample of similar to 6000 pb(-1) collected with the KLOE detector at DAONE. By fitting the observed interference pattern around M(phi) for both final states, we extract the ratio of the decay widths Gamma(omega -> pi(0)gamma)/Gamma(omega -> pi(+)pi(-)pi(0)) = 0.0897 +/- 0.0016 and derive the branching fractions BR(omega -> pi(+)pi(-)pi(0)) = (90.24 +/- 0.19)%, BR(omega -> pi(0)gamma) = (8.09 +/- 0.14)%. The parameters describing the e(+)e(-) -> pi(+)pi(-)pi(0)pi(0) reaction around M(phi) are also used to extract the branching fraction for the OZI and G-parity violating phi -> omega pi(0) decay: BR(phi -> omega pi(0)) = (4.4 +/- 0.6) x 10(-5). (C) 2008 Elsevier B.V. All rights reserved.