Observables in high-statistics measurements of the reactionp¯p→Λ¯Λ

Associated strangeness production has been studied in the p¯p→Λ¯Λ→p¯${\mathrm{\pi }}^{+}$p${\mathrm{\pi }}^{\mathrm{-}}$ reaction at the CERN antiproton facility LEAR using the experimental setup of PS185. Results from two high-statistics measurements at incident antiproton momenta of 1.642 and 1.918 GeV/c are reported. Approximately 40 000 reconstructed events at each momentum have allowed us to measure the total and differential cross sections, the spin polarizations, the spin correlations, and the singlet fractions of the ΛΛ¯ pair. Since the decays of both the Λ and the Λ¯ were simultaneously observed in the same detector, we are able to provide upper limits on CP and CPT violation phenomena in the weak interaction. © 1996 The American Physical Society.