Lepton universality test with K+ --> l+ nu decays

Details Lepton universality test with K+ --> l+ nu decays Lepton universality test with K+ --> l+ nu decays

2009-08-26

arxiv.org/abs/0908.3858v1

PoS KAON09:025,2009

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at the Kaon'09 conference

Scientific paper

The NA62 experiment at CERN collected a large sample of $K^+\to e^+\nu$ decays during a dedicated run in 2007, which allows a precise test of lepton universality by measurement of the helicity suppressed ratio $R_K = \Gamma(K^+\to e^+\nu)/\Gamma(K^+\to\mu^+\nu)$. The preliminary result of the analysis of a partial data sample of 51089 $K^+\to e^+\nu$ candidates is $R_K=(2.500\pm0.016)\times10^{-5}$, consistent with the Standard Model expectation.

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