A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ → e+ν and K+ → μ+ν in a sample of 59 813 reconstructed K+ → e+ν candidates with (8.71 ± 0.24)% background contamination. The result RK = (2.487 ± 0.013) × 10−5 is in agreement with the Standard Model expectation.
Test of Lepton Flavour Universality in K+ → lepton+ neutrino decays
BALDINI, Wander;COTTA RAMUSINO, Angelo;DALPIAZ, Pietro;FIORINI, Massimiliano;GIANOLI, Alberto;PETRUCCI, Ferruccio Carlo;SAVRIE', Mauro;
2011
Abstract
A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ → e+ν and K+ → μ+ν in a sample of 59 813 reconstructed K+ → e+ν candidates with (8.71 ± 0.24)% background contamination. The result RK = (2.487 ± 0.013) × 10−5 is in agreement with the Standard Model expectation.File in questo prodotto:
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