Measurement of the asymmetry in the decay Antiomega+ ---> Antilambda K+ ---> anti-p pi+ K+

The asymmetry in the {bar p} angular distribution in the sequential decay {bar { Omega}}{sup +} {yields} {bar { Lambda}}K{sup +} {yields} {bar p}{pi}{sup +}K{sup +} has been measured to be {bar {alpha}}{sub { Omega}}{bar {alpha}}{sub { Lambda}} = [+1.16{+-}0.18( stat){+-}0.17(syst)]x10{sup -2} using 1.89x10{sup 6} unpolarized {bar { Omega}}{sup +} decays recorded by the Hyper CP (E871) experiment at Fermilab. Using the known value of {alpha}{sub { Lambda}}, and assuming that {bar {alpha}}{sub { Lambda}} = -{alpha}{sub { Lambda}}, {bar {alpha}}{sub { Omega}} = [-1.81{+-}0.28( stat){+-}0.26(syst)]x10{sup -2}. A comparison between this measurement of {bar {alpha}}{sub { Omega}}{bar {alpha}}{sub { Lambda}} and recent measurements of {alpha}{sub { Omega}}{alpha}{sub { Lambda}} made by HyperCP shows no evidence of a violation of CP symmetry.