The branching fraction of Bs0→K0K¯0: three puzzles

Yasmine Amhis, Yuval Grossman, Yosef Nir

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The branching fraction of the Bs→ KK¯ decay has been recently measured by the LHCb and Belle experiments. We study the consistency of the measured value with three relations to other decay rates and CP asymmetries which follow from the Standard Model, and from the approximate flavor SU(3) symmetry of the strong interactions. We find that each of these relations is violated at a level of above 3σ. We argue that various subleading effects — rescattering, electroweak penguins and SU(3) breaking — if larger than theoretically expected, can account for some of these puzzles, but not for all of them simultaneously.

Original languageEnglish
Article number113
JournalJournal of High Energy Physics
Issue number2
StatePublished - Feb 2023
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2023, The Author(s).


  • Bottom Quarks
  • CP Violation
  • Flavour Symmetries


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