Abstract
Differential cross sections and polarizations have been measured for the backward peaks in the reactions π − p→Λ K 0 and π − p→Λ K ∗(890) at 8 GeV/c. The experiment was performed with a liquid hydrogen target at the ω spectrometer. The cross sections for u′>−2 ( GeV/c) 2 are 0.27 ± 0.03 μ b for π − p→Λ+ K 0 and 0.55±0.07 μ b for π − p→Λ K ∗0 . Large positive Λ polarization was observed in both reactions for u′>−0.5 (GeV/ c) 2. The dominant production mechanism was found to be unnatural baryon exchange.
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