Cross Sections and Charged-Particle Multiplicities at 102 and 405 GeV/c

Abstract

We have measured the total inelastic cross section (${\sigma }_{\mathrm{inel}}$) and charged-particle multiplicities obtained in $\mathrm{pp}$ collisions at 405 GeV/c. The data are from a preliminary 12 000-picture bubble-chamber exposure. We find ${\sigma }_{\mathrm{inel}}=32.8\mathrm{}\pm 1.0$ mb; the low moments of the multiplicity distribution for negative particles are $〈n_{-}〉=3.50\mathrm{}\pm 0.07$, $D_{-}=2.37\mathrm{}\pm 0.05$, ${f_2}^{-}=2.1\mathrm{}\pm 0.2$, and ${f_3}^{-}=0.1\mathrm{}\pm 0.9$. We also present updated results at 102 GeV/c.