Test of Lepton Flavour Universality in K+−>l+ν Decays

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A precision test of lepton flavour universality has been performed by measuring the ratio RKRK of kaon leptonic decay rates K+→e+νK+→e+ν and K+→μ+νK+→μ+ν in a sample of 59 813 reconstructed K+→e+νK+→e+ν candidates with (8.71±0.24)%(8.71±0.24)% background contamination. The result RK=(2.487±0.013)×10−5RK=(2.487±0.013)×10−5 is in agreement with the Standard Model expectation.
Original languageEnglish
Pages (from-to)105-114
JournalPhysics Letters B
Issue number2
Publication statusPublished - 4 Apr 2011


  • Lepton universality
  • Leptonic kaon decay


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