Kaon programme at CERN: recent results

Details Kaon programme at CERN: recent results Kaon programme at CERN: recent results

2011-11-11

arxiv.org/abs/1111.2818v1

Physics

High Energy Physics

High Energy Physics - Experiment

Talk given at the EPS HEP 2011 conference (Grenoble, 21-27 July 2011)

Scientific paper

Searches for lepton flavour and lepton number violation in kaon decays by the NA48/2 and NA62 experiments at CERN are presented. A precision measurement of the helicity-suppressed ratio RK of the K --> e nu and K --> mu nu decay rates has been performed using the full data set collected by the NA62 collaboration in 2007. The data sample amounted to 145,958 reconstructed K --> e nu candidates with 11.0% background contamination. The result is RK = (2.488 +- 0.010) X 10^{-5}, which is in agreement with the Standard Model expectation. An improved upper limit on the lepton number violating K+- --> pi-+ mu+- mu+- decay rate is also presented.

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