Observation of Coherent Interference Pattern BetweenρandωDecays

Abstract

We report a high-statistics experiment measuring the structure of $e^{+}{e}^{-}$ mass spectrum from photoproduction of $\rho$ and $\omega$ mesons. At 5.1 GeV, based on 4000 events, analysis of the spectra yields a ratio of vector-meson-photon coupling constants $\frac{{{\gamma }_{\omega }}^2}{{{\gamma }_{\rho }}^2}={9.4}_{-1.6\mathrm{}}^{+2.6\mathrm{}}$ and a $\rho -\omega$ phase difference ${\varphi }_{\omega \rho }={41}^{\circ }\pm {20}^{\circ }$.