A measurement of the branching ratio of the rare leptonic kaon decay± → μ±νμe+e- is presented using data collected by the NA48/2 experiment in 2003 and 2004. The measurement is performed in the region Mee > 140 MeV/c2. In this particular region low energy QCD contributions become important and can be calculated in the framework of Chiral Perturbation Theory (ChPT). From a total number of 1.56 × 1011 recorded kaon decays, the branching ratio is measured to be B (K± → μ±νμe+e-|Mee > 140MeV/c2) = (7.8 ±0.2) × 10-8.
|Original language||English (US)|
|Journal||Proceedings of Science|
|State||Published - 2016|
|Event||38th International Conference on High Energy Physics, ICHEP 2016 - Chicago, United States|
Duration: Aug 3 2016 → Aug 10 2016
ASJC Scopus subject areas