Determination of theω→π+π−Decay Amplitude from Photoproduction

Abstract

Interference between ${\rho }^0$ and $\omega$ photoproduced from carbon, aluminum, and lead has been studied in the $2\pi$ decay mode. The branching ratio $\frac{(\omega \to 2\pi )}{(\omega \to 3\pi )}$ is 2.8 ± 0.6%. The phase difference between the decay amplitudes $\omega \to 2\pi$ and ${\rho }^0\to 2\pi$ is 63° ± 16°.