New physics limits from kaon decays

الأصل · EN

Searches for lepton flavour violation and lepton number violation in kaon decays by the NA62 and NA48/2 experiments at CERN are presented. A new measurement of the ratio of charged kaon leptonic decay rates Rₖ=Γ(Kₑ₂)/Γ(Kμ₂) to sub-percent relative precision is discussed. An improved upper limit on the lepton number violating K±→π∓μ±μ± decay rate is also reported. The future 10% precision measurement of the branching ratio of the ultra-rare kaon decay K+→π+νν with the NA62 experiment is finally reviewed.