Compilation of Data forπ±pInclusive Reactions at 8 and 18.5 GeV/c. I. Single-Particle Distributions

Production of negative pions in the single-particle inclusive reactions ${\pi }^{-}+p\to {\pi }^{-}+\mathrm{anything}$ at 8 and 18.5 GeV/c and ${\pi }^{+}+p\to {\pi }^{-}+\mathrm{anything}$ at 18.5 GeV/c is analyzed in terms of different sets of kinematic variables for various reference frames. Proton fragmentation is studied in terms of ($P_l$, ${P_T}^2$) in the lab system. In the c.m. system, the variables ($x$, ${P_T}^2$) are useful for the study of incident-particle effects and the energy dependence of cross sections. The variables ($y$, ${P_T}^2$) allow a more detailed study of the kinematic region near $x=0\mathrm{}$. The variables ($y_r$, ${P_T}^2$) are particularly useful in that the reduced rapidity $y_r$ has a fixed kinematic boundary independent of $s$ and ${P_T}^2$. Topological cross sections and multiplicity moments are presented.