<i>A</i>dependence of<i>J</i>/ψ and ψ’ production at 800 GeV/<i>c</i>

Abstract

The yield of J/\ensuremath{\psi} and \ensuremath{\psi}' vector-meson states has been measured for 800-GeV protons incident on deuterium, carbon, calcium, iron, and tungsten targets. A depletion of the yield per nucleon from heavy nuclei is observed for both J/\ensuremath{\psi} and \ensuremath{\psi}' production. This depletion exhibits a strong dependence on ${\mathit{x}}_{\mathit{F}}$ and ${\mathit{p}}_{\mathit{t}}$. Within experimental errors the depletion is the same for the J/\ensuremath{\psi} and the \ensuremath{\psi}'.