PRODUCTION OF LAMBDA0 AND SIGMA0 HYPERONS BY PIONS OF BEAM MOMENTA 1.12-1.32-BEV/C

Total cross sections, angular distributions, and polarization distributions have been measured for the reactions π-p→Λ0K0 and π-p→0K0 at beam momenta of 1.12, 1.23, 1.27, and 1.32 BeV/c. Legendrepolynomical expansion coefficients for angular distributions and polarization distributions are presented and compared with other data. Two approximate cross-section equalities are demonstrated among I=12 total cross sections over a wide range of energies: σI=12(K)≅σ(ΛK), and σ(ηN)≅σ(ΛK)+σI=12(K) where σ(ηN) is the total cross section for π-p→ηn. Hyperon decay asymmetries observed in the reaction π-p→ΛK0 are difficult to reconcile with a value of αΔ=0.66. © 1969 The American Physical Society.