PHOTOPRODUCTION OF VECTOR MESONS AND OTHER RESONANCES AT 4.3-BEV

The Stanford Linear Accelerator Center 40-in. hydrogen bubble chamber was exposed to 4.3-BeV positron-annihilation radiation. Results are presented on reactions containing no neutrals and one neutral particle in the final state. For γp→ρ0p and ω0p we find cross sections of 19.2 ± 1.2 and 2.8 ± 0.5 μb, respectively. Assuming vector dominance, we determine the V0p cross sections. Evidence for other resonant states is presented, in particular Δ++V0π-, where we find Δ++ρ0π-Δ++ω0π- about 1.5. © 1969 The American Physical Society.