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Search for the Lepton-Number-Violating Decay $Ξ^- \to p μ^- μ^-$

HyperCP Collaboration·D. Rajaram·R. A. Burnstein·A. Chakravorty·Y. C. Chen·W. -S. Choong·K. Clark·E. C. Dukes·C. Durandet·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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Abstract

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

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HyperCP Collaboration, D. Rajaram, R. A. Burnstein, A. Chakravorty, Y. C. Chen, W. -S. Choong, K. Clark, E. C. Dukes, C. Durandet, 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. 2005-05-12. Search for the Lepton-Number-Violating Decay $Ξ^- \to p μ^- μ^-$. https://doi.org/10.1103/physrevlett.94.181801

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