K → μ + μ as a clean probe of short-distance physics

Avital Dery, Mitrajyoti Ghosh, Yuval Grossman, Stefan Schacht

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The K → μ+μ decay is often considered to be uninformative of fundamental theory parameters since the decay is polluted by long-distance hadronic effects. We demonstrate that, using very mild assumptions and utilizing time-dependent interference effects, ℬ(KS → μ+μ)ℓ=0 can be experimentally determined without the need to separate the ℓ = 0 and ℓ = 1 final states. This quantity is very clean theoretically and can be used to test the Standard Model. In particular, it can be used to extract the CKM matrix element combination ∣ VtsVtdsin (β+ βs) ∣ ≈ ∣ A2λ5η¯ ∣ with hadronic uncertainties below 1%.

Original languageEnglish
Article number103
JournalJournal of High Energy Physics
Issue number7
StatePublished - Jul 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021, The Author(s).


  • CP violation
  • Kaon Physics
  • Quark Masses and SM Parameters


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