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We have measured the alpha parameter of the Omega- to Lambda K- decay usingdata collected with the HyperCP spectrometer during the 1997 fixed-target runat Fermilab. Analyzing a sample of 0.96 million Omega- to Lambda K^-, Lambda top pi- decays, we obtain alpha_Omega*alpha_Lambda =[1.33+/-0.33(stat)+/-0.52(syst)] x 10^{-2}. With the accepted value ofalpha_Lambda, alpha_Omega is found to be [2.07+/-0.51(stat)+/-0.81(syst)] x10^{-2}.Comment: 5 pages, 4 figures, to be appeared as a Rapid Communication in Phys.  Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>asymmetry parameter for the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>Ω</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>Λ</mml:mi><mml:msup><mml:mi>K</mml:mi><mml:mo>−</mml:mo></mml:msup></mml:math>Decay

Measurement of theαasymmetry parameter for theΩ−→ΛK−Decay