Abstract
The experiment NA62 at CERN collected a large sample of K± leptonic decays in order to perform precise test of lepton universality, by measuring the helicity suppressed ratio RK = Γ(K± → e±ν)/Γ(K± → μ±ν). The final result of the analysis based on 59,963 K+ → e+ν candidates (∼ 40% of the total data set) is RK = (2.486 ± 0.013) × 10−5 and consistent with the predictions of the Standard Model. The aim for the future program of the experiment is to measure the branching ratio of the ultra-rare decay K+ → π+νν with 10% precision.
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