π+p,K+p, andpptopological cross sections and inclusive interactions at 100 GeV using a hybrid bubble-chamber-spark-chamber system and a tagged beam

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Abstract

${\ensuremath{\pi}}^{+}p$, ${K}^{+}p$, and $\mathrm{pp}$ interactions at 100 GeV are studied using the Fermilab hybrid 30-inch bubble chamber with associated downstream multiparticle spectrometer and an unseparated tagged positive beam. Topological cross sections and charged-particle-multiplicity moments are presented and good agreement is found with Koba-Nielsen-Olesen scaling. The charged-multiplicity second moment, ${f}_{2}^{\mathrm{cc}}$, and the second moment of produced (+ -) pairs, ${f}_{2}^{\ensuremath{-}\ensuremath{-}}$, are presented both with and without the diffractive-dissociation events, and are discussed in terms of the two-component model invoked to explain $\mathrm{pp}$ multiplicity distributions above 100 GeV. Single-particle inclusive distributions are presented and studied in terms of the Regge-Mueller forms of approach to scaling at asymptotic energies. Pomeron factorization is found to hold in the target-proton-associated backward center-of-mass hemisphere for inclusive particle production by incident ${\ensuremath{\pi}}^{+}$, ${K}^{+}$, and protons.

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