ψ′Photoproduction at a Mean Energy of 150 GeV

Abstract

A measurement of the diffractive ${\psi }^{\prime }$ photoproduction cross section is presented. The ratio of the ${\psi }^{\prime }$ photoproduction cross section to the $\psi$ photoproduction cross section is found to be 0.20 ± 0.05 at an average energy of 150 GeV. With vector-meson dominance, the ratio of ${\psi }^{\prime }$-nucleon to $\psi$-nucleon cross sections is 0.75 ± 0.12.