Lepton universality tests with leptonic kaon decays

Details Lepton universality tests with leptonic kaon decays Lepton universality tests with leptonic kaon decays

2011-01-30

arxiv.org/abs/1101.5817v1

Physics

High Energy Physics

High Energy Physics - Experiment

Proceedings of CKM2010, the 6th International Workshop on the CKM Unitarity Triangle, University of Warwick, UK, 6-10 Septembe

Scientific paper

The NA62 experiment at CERN aims to use rare kaon decays to search for new phenomena beyond the Standard Model. During the current short term phase (data taking completed in years 2007-8), the ratio $R_K = \Gamma(K^+ \rightarrow e \nu_e (\gamma)) / \Gamma(K^+ \rightarrow \mu \nu_{\mu} (\gamma))$ of leptonic decay rates is studied, which tests the structure of weak interactions and lepton flavour universality. In this paper, the $R_K$ analysis is summarized, and the preliminary result is discussed, based on 59963 $K^+ \rightarrow e \nu_e $ candidates collected in 2007.

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