Charged-lepton-flavor violation in |ΔS| = 1 hyperon decays

Xiao Gang He, Jusak Tandean, German Valencia

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7 Citations (Scopus)


Studies of lepton-flavor violation in strangeness-changing (|ΔS| = 1) transitions have a long tradition in the kaon sector where they provide some of the strongest limits on physics beyond the standard model. Recent hints of violation of lepton-flavor universality in B-meson decays have revived interest in lepton-flavor violation as the two phenomena appear simultaneously in many extensions of the standard model. At the same time, the LHCb experiment has produced new results for the hyperon process Σ+ → pμ+μ and may be in a position to study other rare hyperon decay modes. With this in mind, we investigate |ΔS| = 1 hyperon decays into different-flavor lepton pairs e±μ in a model-independent manner and contrast the coverage of parameter space that can be achieved with what is known from kaon modes. We include a comparison with selected two-body leptonic decays of charged mesons, with K → πνv¯ modes, with μ → e conversion, and with lepton-flavor violating decays of other neutral mesons, all of which constrain the same parameter space in a complementary way.

Original languageEnglish
Article number22
Number of pages25
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 1 Jul 2019


  • Beyond Standard Model
  • Chiral Lagrangians
  • Effective Field Theories
  • Kaon Physics

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