Measurement of the ratio of the charged kaon leptonic decays at NA62

Abstract

The ratio of the leptonic charged kaon decays $R_K=\Gamma (K^{\pm }\to e^{\pm }\nu )/\Gamma (K^{\pm }\to {\mu }^{\pm }\nu )$ is sensitive to the structure of the week interactions and can be precisely calculated within the Standard Model. Presence of New Physics can introduce a shift on its value of the order of a percent. The NA62 experiment at CERN SPS used data from a dedicated run in 2007 to perform a measurement of this ratio and probe the lepton universality. The data analysis technique and the final results are presented.

5 pages, 4 figures, contribution to the proceedings of the 9th International Workshop on e+ e- Collisions "From phi to psi 2013", Rome, 9-12 Sept 2013, to be published in Int. J. Mod. Phys. Conf. Ser

References in corpus (2)

• The Standard Model prediction for R_{e/mu}^{(pi,K)}
• Test of Lepton Flavour Universality in K+ --> l+nu Decays