Heavy neutrino searches and NA62 status

Abstract

The NA62 experiment at CERN SPS recorded in 2007 a large sample of $K^{+}\to {\mu }^{+}{\nu }_{\mu }$ decays. A peak search in the missing mass spectrum of this decay is performed. In the absence of observed signal, the limits obtained on $\mathcal{B}(K^{+}\to {\mu }^{+}{\nu }_h)$ and on the mixing matrix element $|U_{\mu 4}{|}^2$ are reported. The upgraded NA62 experiment started data taking in 2015, with the aim of measuring the branching fraction of the $K+\to {\pi }^{+}\nu \bar{\nu }$ decay. An update on the status of the experiment is presented.

arXiv comment8 pages, 7 figures, Talk given at 52nd Rencontres de Moriond (EW session), La Thuile, 18-25 March 2017