Search for the Lepton-Number-Violating Decay Xi^- to p μ^- μ^-

HyperCP Collaboration: D. Rajaram , 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 L. C. Lu W. Luebke K.-B. Luk K. S. Nelson H. K. Park J.-P. Perroud H. A. Rubin J. Volk C. G. White S. L. White P. Zyla

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classification ✦ hep-ex

keywords decaylepton-number-violatingsearchbeenbestcollisionsconfidencefour

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A sensitive search for the lepton-number-violating decay $\Xi^-\to p \mu^-\mu^-$ has been performed using a sample of $\sim10^9$ $\Xi^-$ hyperons produced in 800 GeV/$c$ $p$-Cu collisions. We obtain $\mathcal{B}(\Xi^-\to p \mu^-\mu^-)< 4.0\times 10^{-8}$ at 90% confidence, improving on the best previous limit by four orders of magnitude.

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