Lepton flavour universality and lepton flavour conservation tests at CERN
2013
A precision lepton universality test by measurement of the helicity suppressed ratio of leptonic
decay rates of the charged kaon with 10e5 K+- ->e+- nu decays collected by the NA62 experiment in
2007-08 is presented. The record accuracy of 0.4% constrains the parameter space of new physics
models with extended Higgs sector, a fourth generation of quarks and leptons or sterile neutrinos.
An improved upper limit on the rate of the lepton number violating decay K+- -> mu+- mu+- from
the NA48/2 experiment, which probes the resonant enhancement of the rate in the presence of
heavy Majorana neutrinos in the 100 MeV range, is also presented.
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