Search for heavy charged particles and light nuclei and antinuclei produced by 400-GeV protons

The results of a search for the production of heavy charged particles in 400-GeV proton collisions in copper are presented. The experiment was sensitive to particles of mass 4 to 12 GeV/${c}^{2}$ having lifetimes \ensuremath{\ge}3\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}9}$ sec. No particles of this type were observed. A 90% confidence limit of 2.5\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}36}$ ${\mathrm{cm}}^{2}$${\mathrm{GeV}}^{\mathrm{\ensuremath{-}}2}$${\mathrm{nucleon}}^{\mathrm{\ensuremath{-}}1}$ is placed on the invariant production cross section for negative particles, and a similar limit of ${10}^{\mathrm{\ensuremath{-}}35}$ ${\mathrm{cm}}^{2}$${\mathrm{GeV}}^{\mathrm{\ensuremath{-}}1}$${\mathrm{nucleon}}^{\mathrm{\ensuremath{-}}1}$ for positively charged particles. In addition, the production of the deuteron, antideuteron, and triton were measured using the same apparatus.