Test of Lepton Flavour Universality in K+ --> l+nu Decays

Abstract

A precision test of lepton flavour universality has been performed by measuring the ratio RK of kaon leptonic decay rates K+ --> e+nu and K+ --> mu+nu in a sample of 59813 reconstructed K+ --> e+nu 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.

16 pages, 6 figures. Accepted for publication in Phys. Lett. B

References in corpus (5)

• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• Search for direct CP violating charge asymmetries in $K^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ and $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ decays
• Anatomy and Phenomenology of the Lepton Flavor Universality in SUSY Theories
• Supersymmetric Grand Unification and Lepton Universality in K-> l νDecays
• Analysis of $K^{+}\to e^{+}{\nu }_e\gamma$ in light-front quark model and chiral perturbation theory of order $p^6$

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• Search for heavy neutral lepton production in $K^{+}$ decays
• Experiments with K-Meson Decays
• Status of the fourth fermion generation before ICHEP2012: Higgs data and electroweak precision observables
• Lepton Universality in the $\nu$MSM
• Gamma(K -> e nu)/Gamma(K -> mu nu) in the Minimal Supersymmetric Standard Model
• NA62 experiment at CERN SPS
• Theoretical overview of kaon decays
• Measurement of the ratio of the charged kaon leptonic decays at NA62
• Kaon Physics: Theory Overview