Charged- and neutral-particle production from 400-GeV/cppcollisions

Charged- and neutral-particle production from 400-GeV/c $\mathrm{pp}$ collisions are measured simultaneously using the Fermilab 15-ft bubble chamber. The ${\pi }^0$ and $K^0$ cross sections are rising at Fermilab energies, while the ${\Lambda }^0$ cross section remains fairly constant. Similarly, the average number of ${\pi }^0$'s and $K^0$'s increases as a function of the number of negative particles in an event, yet no such dependence is noted for the ${\Lambda }^0$'s. The ratio of average number of ${\pi }^0$ to average number of ${\pi }^{-}$ per inelastic collisions is found to be constant at Serpukhov and Fermilab energies (40 to 400 GeV/c) and equal to 1.22±0.02. Cross sections for ${\Sigma }^0$ and ${\overline{\Sigma }}^0$ production are measured and limits are found for ${\eta }^0$ and ${\omega }^0$ production. Neutral- and charged-pion correlations are compared with five pion-production models.