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Experiment E800 at Fermilab using the E800 spectrometer has made a precise measurement of the non‐leptonic weak decay parameters for the spin 3/2 decay, Ω−→Δ°+K−. The paratmeters determined are αδαΩ=0.0126±0.0042, αΩ=0.0196±0.0066, and ϕπ=−3.4°±10.3°. This measurement of αΩ is nearly four times more precise than the previous world average value of −0.026±0.026 and shows this parameter to be inconsistent with zero. Also, E800 has made the first measurement of ϕΩ. (AIP) © 1995 American Institute of Physics

A precise measurement of the non-leptonic weak decay parameters α and φ in the spin 3/2 decay ω−→Λ0+K−