Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay

HyperCP Collaboration: L.C. Lu , R.A. Burnstein , A. Chakravorty , Y.C. Chen , W.-S. Choong , K. Clark , E.C. Dukes , C. Durandet

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J. Felix Y. Fu G. Gidal H.R. Gustafson T. Holmstrom M. Huang C. James C.M. Jenkins T.D. Jones D.M. Kaplan M.J. Longo W. Luebke K.-B. Luk K.S. Nelson H.K. Park J.-P. Perroud D. Rajaram H.A. Rubin J. Volk C.G. White S.L. White P. Zyla

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classification ✦ hep-ex

keywords decayomega-minusk-minuslambdaalphaparameterparityviolation

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The alpha decay parameter in the process Omega-minus -> Lambda + K-minus has been measured from a sample of 4.50 million unpolarized Omega-minus decays recorded by the HyperCP (E871) experiment at Fermilab and found to be [1.78 +/- 0.19(stat) +/- 0.16(syst)]{\times}10^{-2}. This is the first unambiguous evidence for a nonzero alpha decay parameter, and hence parity violation, in the Omega-minus -> Lambda + K-minus decay.

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Observation of Parity Violation in the Omega-minus -> Lambda + K-minus Decay

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