Abstract
Production cross-sections and angular distributions of Λ and K° particles produced by 11.4GeV/c π-mesons in hydrogen have been measured. A systematic investigation was made of all two-body decays of unstable neutral particles. No events inconsistent with γ, Λ, or K° were found. Production cross-sections, angular distributions and effective mass distributions of π-mesons produced in 4-prong events were also measured. No evidence for dominance of any high-mass multi-pion resonance was found. Both the pion production and strange-particle production reactions demonstrated peripheral characteristics in that the baryon was strongly peaked backward in the center of mass. The average transverse momentum was observed to be a monotically increasing function of mass. The experimental total interaction cross-section was (25.3±1.5) mb. The effect of the pion-nucleon T=3/2 isobar was clearly observed.
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