Nuclear dependence of the production of Υ resonances at 800 GeV

The yields of the 1S and the sum of the 2S and 3S Υ resonances have been measured for 800-GeV protons incident on targets of ${}_{}{}^2{}_{}{}^{}\mathrm{H}$, C, Ca, Fe, and W. A significant nuclear dependence is seen in the yield per nucleon which, within errors, is the same for the Υ(1S) and Υ(2S+3D) states. A large decrease in the relative yield from heavy nuclei is found for the range ${\mathit{x}}_{\mathit{F}}$<0. Significant nuclear dependence is also observed in the ${\mathit{p}}_{\mathit{t}}$ distribution. Differential cross sections for the Υ(1S) for ${}_{}{}^2{}_{}{}^{}\mathrm{H}$ are presented over the ranges 0.24≤${\mathit{p}}_{\mathit{t}}$≤3.4 GeV/c and -0.15≤${\mathit{x}}_{\mathit{F}}$≤0.5.