Heavy-Particle Production in 300-GeV/cProton/Tungsten Collisions

A search was made for massive particles produced by 300-GeV/c protons, A 1.1-km flight path through a beam transport system permitted the measurement of the production of heavy particles for secondary momenta of 25 to 200 GeV/c. No counts were obtained for masses greater than 2 GeV${/\mathit{c}}^2$ among 5.5 × ${10}^7$ secondary particles. Cross sections are presented for forward production of ${\pi }^{+}$, ${\pi }^{-}$, $p$, $\overline{p}$, $d$, and $\overline{d}$.