Photoproduction of ϱo on hydrogen with tagged photons between 4 and 6 GeV

We have measured the reaction γp → pπ+π− in the DESY 1 m Streamer Chamber. The dominant ϱo production is analyzed in terms of various models

Photoproduction of ρ0\rho^0, ω\omega and ρ−\rho^- mesons on deuterons at energies between 1 and 5 GeVGeV

The reactions γ d → ϱ 0 d, γ d → ω d and γ n → ϱ − p have been investigated in a deuterium bubble chamber experiment at DESY with a bremsstrahlung beam of 5.5 GeV maximum energy. Effective mass distributions as well as total and differential cross sections are presented. The results are compared with ϱ 0 and ω production on protons