Search for CP Violation in Charged-Xi and Lambda Hyperon Decays

HyperCP Collaboration: T. Holmstrom , N. Leros , R. A. Burnstein , A. Chakravorty , A. Chan , Y. C. Chen , W. S. Choong , K. Clark

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E. C. Dukes C. Durandet J. Felix Y. Fu G. Gidal P. Gu H. R. Gustafson C. Ho M. Huang C. James C. M. Jenkins T. Jones D. M. Kaplan L. M. Lederman M. J. Longo F. Lopez L. C. Lu W. Luebke K. B. Luk K. S. Nelson H. K. Park J. P. Perroud D. Rajaram H. A. Rubin P. K. Teng J. Volk C. G. White S. L. White P. Zyla

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classification ✦ hep-ex

keywords alphalambdapi-minuspi-plusantiprotondecaysmillionproton

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We have compared the proton and antiproton angular distributions in 117 million Xi-minus -> Lambda + pi-minus -> proton + pi-minus + pi-minus and 41 million anti-Xi-minus -> anti-Lamba + pi-plus -> antiproton + pi-plus + pi-plus decays using a subset of the data from the HyperCP experiment (E871) at Fermilab. We find no evidence of CP violation, with the direct-CP-violating parameter $A_{\Xi\Lambda} = \frac{\alpha_{\Xi}\alpha_{\Lambda} - \bar{\alpha}_{\Xi}\bar{\alpha}_{\Lambda}}{\alpha_{\Xi}\alpha_{\Lambda} + \bar{\alpha}_{\Xi}\bar{\alpha}_{\Lambda}} = [0.0+/-5.1(stat)+/-4.4(syst)]{\times}10^{-4}$.

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Search for CP Violation in Charged-Xi and Lambda Hyperon Decays

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