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

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

2011-01-25

arxiv.org/abs/1101.4805v2

Phys.Lett.B698:105-114,2011

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

10.1016/j.physletb.2011.02.064

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.

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