Precision Measurement of the Ratio of the Charged Kaon Leptonic Decay Rates

The NA62 collaboration

Precision Measurement of the Ratio of the Charged Kaon Leptonic Decay Rates

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arxiv 1212.4012 v2 pith:EKAKLGKA submitted 2012-12-17 hep-ex

Precision Measurement of the Ratio of the Charged Kaon Leptonic Decay Rates

The NA62 collaboration This is my paper

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A precision measurement of the ratio RK of the rates of kaon leptonic decays K+- --> e nu and K+- --> mu nu with the full data sample collected by the NA62 experiment at CERN in 2007-2008 is reported. The result, obtained by analysing ~150000 reconstructed K+- --> e nu candidates with 11% background contamination, is RK = (2.488+-0.010)*10^{-5}, in agreement with the Standard Model expectation.

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