Long distance contribution to KL → ℓ+ℓ-

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We revisit the calculation of the long distance contribution to KL → μ+μ-. We discuss this process within the framework of chiral perturbation theory, and also using simple models for the KLγ*γ* vertex. We argue that it is unlikely that this mode can be used to extract information on short distance parameters. The process KL → e+e- is also long-distance dominated and we find that B(KL → e+e-) ≈ 9 × 10-12.

Original languageEnglish
Pages (from-to)339-352
Number of pages14
JournalNuclear Physics B
Issue number1-3
Publication statusPublished - 27 Apr 1998
Externally publishedYes


  • Chiral perturbation theory
  • Rare kaon decays electromagnetic contributions to kaon decays long distance contributions

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